In what units is length measured? International System of Units SI

The size of the penis is a very important nuance for a man. Every guy has measured his organ at least once or is planning to do so.

Getting accurate results is a simple task, you just need to follow the rules. But most men make mistakes and do not know how to measure their penis correctly, which often leads to incorrect results.

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Average size statistics by age

Age	Length(cm)	Thickness(cm)
12-13	10.5-13	7.5-8
14-15	15-16	9.5-10.5
16-17	15.5-16	11.5-12
18+	15.5+	12+

After 18 years, a man’s penis is already formed and has reached its maximum size.

Statistics that were carried out to find out what the average is for men:

Video about statistics and sizes of the male organ:

Why is this necessary?

Basically, this is done for yourself, to calm the ego.

For the first time such a thought comes to me during my school years. The problem with penis length worries all schoolchildren in the world. And often young guys don’t know how to measure it.

The main reason you need to know is to choose the right condom size. There are a number of models that will be large or small in relation to the penis. To avoid discomfort or unexpected outcomes, it is better to know in advance how to measure your penis and remember the size of your “comrade” by heart.

What conditions to comply with?

Men think that in order to measure a “friend”, it is enough to wait for the erect state and apply a ruler to it. This approach will give the wrong result. There are a number of factors and favorable conditions for obtaining correct measurements.

• Only measure your penis at room temperature. If the room is cold, the phallus will decrease in size.
• Stress and anxiety affect the size of the phallus. During measurements, you should be calm and full of energy.
• Z perform measures only in a state of complete arousal so that the erection is as strong as possible.

It is best to measure in the morning, on a day off. During this period, the body is full of strength and the erection will be maximum.

How to measure penis length

Correct measurement of penis length occurs in several stages. The main thing is that all conditions are met.

1. Measurements are taken standing, not sitting. In this state, the penis is not retracted and the entire shaft is visible.
2. The penis should be parallel to the ground. To do this, you can tilt it down.
3. For measurements, use a ruler or centimeter.
4. We apply one edge to the pubis, and the second to the extreme point of the head. The result will be the length of the penis.

Many people measure their penis from the testicles - this is wrong. You should start measuring from the pubic area.

How to measure penis diameter

№4 – Pharmacology. There are a number of products on sale, their task is to increase the size of the penis.

№5 – . This includes gels that have a beneficial effect on penis growth.

№6 – . A vacuum cylinder that causes an erection and increases the size of the penis after procedures.

№7 – . A very unusual method, it is based on massage of the cavernous bodies, with the aim of their growth.

This lesson will not be new for beginners. We have all heard from school such things as centimeter, meter, kilometer. And when it came to mass, they usually said gram, kilogram, ton.

Centimeters, meters and kilometers; grams, kilograms and tons have one common name - units of measurement of physical quantities.

In this lesson we will look at the most popular units of measurement, but we will not delve too deeply into this topic, since units of measurement go into the field of physics. We are forced to study some physics because we need it to further study mathematics.

Lesson content

Units of length

The following units of measurement are used to measure length:

• millimeters
• centimeters
• decimeters
• meters
• kilometers

millimeter(mm). Millimeters can even be seen with your own eyes if you take the ruler that we used at school every day

Small lines running one after another are millimeters. More precisely, the distance between these lines is one millimeter (1 mm):

centimeter(cm). On the ruler, each centimeter is marked with a number. For example, our ruler, which was in the first picture, had a length of 15 centimeters. The last centimeter on this ruler is marked with the number 15.

There are 10 millimeters in one centimeter. One can put an equal sign between one centimeter and ten millimeters, since they indicate the same length

1 cm = 10 mm

You can see this for yourself if you count the number of millimeters in the previous figure. You will find that the number of millimeters (distances between lines) is 10.

The next unit of length is decimeter(dm). There are ten centimeters in one decimeter. An equal sign can be placed between one decimeter and ten centimeters, since they indicate the same length:

1 dm = 10 cm

You can verify this if you count the number of centimeters in the following figure:

You will find that the number of centimeters is 10.

The next unit of measurement is meter(m). There are ten decimeters in one meter. You can put an equal sign between one meter and ten decimeters, because they indicate the same length:

1 m = 10 dm

Unfortunately, the meter cannot be illustrated in the figure because it is quite large. If you want to see the meter live, take a tape measure. Everyone has it in their home. On a tape measure, one meter will be designated as 100 cm. This is because there are ten decimeters in one meter, and one hundred centimeters in ten decimeters:

1 m = 10 dm = 100 cm

100 is obtained by converting one meter to centimeters. This is a separate topic that we will look at a little later. For now, let's move on to the next unit of length, which is called the kilometer.

The kilometer is considered the largest unit of length. There are, of course, other higher units, such as megameter, gigameter, terameter, but we will not consider them, since a kilometer is enough for us to further study mathematics.

There are a thousand meters in one kilometer. You can put an equal sign between one kilometer and a thousand meters, since they indicate the same length:

1 km = 1000 m

Distances between cities and countries are measured in kilometers. For example, the distance from Moscow to St. Petersburg is about 714 kilometers.

International System of Units SI

The International System of Units SI is a certain set of generally accepted physical quantities.

The main purpose of the international system of SI units is to achieve agreements between countries.

We know that the languages ​​and traditions of the countries of the world are different. There's nothing to be done about it. But the laws of mathematics and physics work the same everywhere. If in one country “twice two is four,” then in another country “twice two is four.”

The main problem was that for each physical quantity there are several units of measurement. For example, we have now learned that to measure length there are millimeters, centimeters, decimeters, meters and kilometers. If several scientists speaking different languages ​​gather in one place to solve a particular problem, then such a large variety of units of measurement of length can give rise to contradictions between these scientists.

One scientist will state that in their country length is measured in meters. The second may say that in their country the length is measured in kilometers. The third may offer his own unit of measurement.

Therefore, the international system of SI units was created. SI is an abbreviation for the French phrase Le Système International d’Unités, SI (which translated into Russian means the international system of units SI).

The SI lists the most popular physical quantities and each of them has its own generally accepted unit of measurement. For example, in all countries, when solving problems, it was agreed that length would be measured in meters. Therefore, when solving problems, if the length is given in another unit of measurement (for example, in kilometers), then it must be converted into meters. We'll talk about how to convert one unit of measurement to another a little later. For now, let's draw our international system of SI units.

Our drawing will be a table of physical quantities. We will include each studied physical quantity in our table and indicate the unit of measurement that is accepted in all countries. Now we have studied the units of length and learned that the SI system defines meters to measure length. So our table will look like this:

Mass units

Mass is a quantity indicating the amount of matter in a body. People call body weight weight. Usually when something is weighed they say “It weighs so many kilograms” , although we are not talking about weight, but about the mass of this body.

However, mass and weight are different concepts. Weight is the force with which the body acts on a horizontal support. Weight is measured in newtons. And mass is a quantity that shows the amount of matter in this body.

But there is nothing wrong with calling body weight weight. Even in medicine they say "person's weight" , although we are talking about the mass of a person. The main thing is to be aware that these are different concepts.

The following units of measurement are used to measure mass:

• milligrams
• grams
• kilograms
• centners
• tons

The smallest unit of measurement is milligram(mg). You will most likely never use a milligram in practice. They are used by chemists and other scientists who work with small substances. It is enough for you to know that such a unit of measurement of mass exists.

The next unit of measurement is gram(G). It is customary to measure the amount of a particular product in grams when preparing a recipe.

There are a thousand milligrams in one gram. You can put an equal sign between one gram and a thousand milligrams, because they mean the same mass:

1 g = 1000 mg

The next unit of measurement is kilogram(kg). The kilogram is a generally accepted unit of measurement. It measures everything. The kilogram is included in the SI system. Let us also include one more physical quantity in our SI table. We will call it “mass”:

There are a thousand grams in one kilogram. You can put an equal sign between one kilogram and a thousand grams, because they mean the same mass:

1 kg = 1000 g

The next unit of measurement is hundredweight(ts). In centners it is convenient to measure the mass of a crop collected from a small area or the mass of some cargo.

There are one hundred kilograms in one centner. You can put an equal sign between one centner and one hundred kilograms, because they mean the same mass:

1 c = 100 kg

The next unit of measurement is ton(T). Large loads and masses of large bodies are usually measured in tons. For example, the mass of a spaceship or car.

There are one thousand kilograms in one ton. You can put an equal sign between one ton and a thousand kilograms, because they mean the same mass:

1 t = 1000 kg

Time units

There is no need to explain what time we think is. Everyone knows what time is and why it is needed. If we open the discussion to what time is and try to define it, we will begin to delve into philosophy, and we do not need this now. Let's start with the units of time.

The following units of measurement are used to measure time:

• seconds
• minutes
• day

The smallest unit of measurement is second(With). There are, of course, smaller units such as milliseconds, microseconds, nanoseconds, but we will not consider them, since at the moment this makes no sense.

Various parameters are measured in seconds. For example, how many seconds does it take for an athlete to run 100 meters? The second is included in the SI international system of units for measuring time and is designated as "s". Let us also include one more physical quantity in our SI table. We will call it “time”:

minute(m). There are 60 seconds in one minute. One minute and sixty seconds can be equated because they represent the same time:

1 m = 60 s

The next unit of measurement is hour(h). There are 60 minutes in one hour. An equal sign can be placed between one hour and sixty minutes, since they represent the same time:

1 hour = 60 m

For example, if we studied this lesson for one hour and we are asked how much time we spent studying it, we can answer in two ways: “we studied the lesson for one hour” or so “we studied the lesson for sixty minutes” . In both cases, we will answer correctly.

The next unit of time is day. There are 24 hours in a day. You can put an equal sign between one day and twenty-four hours, since they mean the same time:

1 day = 24 hours

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> Length

Explore length in physics: how length is indicated, letter and formula for length, how to find. Read about the designation of length, unit of measurement, definition, types of quantities.

Length– one of the basic characteristics of measuring an object in physics.

Learning Objective

• Understand how to determine the length of an object.

Main points

• Length is a measure of the longest dimension of the body.
• Deformation is a change in length.
• The unit of measurement is meter.

Terms

• Special Relativity: Reconciles the principle of relativity with the notion that the speed of light remains constant in all frames of reference.
• Dimension is a measure of spatial extent in a specific direction (height, width, depth, length).

Length

Length in physics reflects one of the characteristics of an object. Moreover, this concept is widely used in everyday life. For example, you can cut a certain length of wire. It can differ in height (vertical extent) or width (distance between sides).

Length is a measure of one dimension, area is a measure of two (the square of length), and volume is a measure of three. Due to the special theory of relativity, length is not considered constant in all frames of reference. Therefore, your meter ruler will not display one value. It changes depending on the observer.

Units

What is the unit of length in physics? One of the oldest measurements is the cubit (from the tip of the finger to the elbow). It was then divided into a leg, an arm or a finger. They could also increase the step. However, such units are not stable, because the size of the elbow varies depending on the person.

In physics, length has become synonymous with distance. Units may be based on body parts or distance traveled between certain points. The official one is the meter and is determined in relation to the speed of light. Centimeters and kilometers are also used. In the English system - inch, foot, yard and mile. When talking about cosmic distances, they use light year and parsec.

A metric length of 1 km is equivalent to 0.62137 miles

Magnitude is something that can be measured. Concepts such as length, area, volume, mass, time, speed, etc. are called quantities. The value is measurement result, it is determined by a number expressed in certain units. The units in which a quantity is measured are called units of measurement.

To indicate a quantity, a number is written, and next to it is the name of the unit in which it was measured. For example, 5 cm, 10 kg, 12 km, 5 min. Each quantity has countless values, for example the length can be equal to: 1 cm, 2 cm, 3 cm, etc.

The same quantity can be expressed in different units, for example kilogram, gram and ton are units of weight. The same quantity in different units is expressed by different numbers. For example, 5 cm = 50 mm (length), 1 hour = 60 minutes (time), 2 kg = 2000 g (weight).

To measure a quantity means to find out how many times it contains another quantity of the same kind, taken as a unit of measurement.

For example, we want to find out the exact length of a room. This means we need to measure this length using another length that is well known to us, for example using a meter. To do this, set aside a meter along the length of the room as many times as possible. If it fits exactly 7 times along the length of the room, then its length is 7 meters.

As a result of measuring the quantity, we obtain or named number, for example 12 meters, or several named numbers, for example 5 meters 7 centimeters, the totality of which is called compound named number.

Measures

In each state, the government has established certain units of measurement for various quantities. An accurately calculated unit of measurement, adopted as a standard, is called standard or exemplary unit. Model units of the meter, kilogram, centimeter, etc. were made, according to which units for everyday use were made. Units that have come into use and are approved by the state are called measures.

The measures are called homogeneous, if they serve to measure quantities of the same kind. So, gram and kilogram are homogeneous measures, since they are used to measure weight.

Units

Below are units of measurement of various quantities that are often found in mathematics problems:

Weight/mass measures

• 1 ton = 10 quintals
• 1 quintal = 100 kilograms
• 1 kilogram = 1000 grams
• 1 gram = 1000 milligrams

• 1 kilometer = 1000 meters
• 1 meter = 10 decimeters
• 1 decimeter = 10 centimeters
• 1 centimeter = 10 millimeters

• 1 sq. kilometer = 100 hectares
• 1 hectare = 10,000 sq. meters
• 1 sq. meter = 10000 sq. centimeters
• 1 sq. centimeter = 100 square meters millimeters

• 1 cu. meter = 1000 cubic meters decimeters
• 1 cu. decimeter = 1000 cubic meters centimeters
• 1 cu. centimeter = 1000 cubic meters millimeters

Let's consider another quantity like liter. A liter is used to measure the capacity of vessels. A liter is a volume that is equal to one cubic decimeter (1 liter = 1 cubic decimeter).

Measures of time

• 1 century (century) = 100 years
• 1 year = 12 months
• 1 month = 30 days
• 1 week = 7 days
• 1 day = 24 hours
• 1 hour = 60 minutes
• 1 minute = 60 seconds
• 1 second = 1000 milliseconds

In addition, time units such as quarter and decade are used.

• quarter - 3 months
• decade - 10 days

A month is taken to be 30 days unless it is necessary to specify the date and name of the month. January, March, May, July, August, October and December - 31 days. February in a simple year is 28 days, February in a leap year is 29 days. April, June, September, November - 30 days.

A year is (approximately) the time it takes for the Earth to complete one revolution around the Sun. It is customary to count every three consecutive years as 365 days, and the fourth year following them as 366 days. A year containing 366 days is called leap year, and years containing 365 days - simple. One extra day is added to the fourth year for the following reason. The Earth's revolution around the Sun does not contain exactly 365 days, but 365 days and 6 hours (approximately). Thus, a simple year is shorter than a true year by 6 hours, and 4 simple years are shorter than 4 true years by 24 hours, i.e., by one day. Therefore, one day is added to every fourth year (February 29).

You will learn about other types of quantities as you further study various sciences.

Abbreviated names of measures

Abbreviated names of measures are usually written without a dot:

Kilometer - km Meter - m Decimeter - dm Centimeter - cm Millimeter - mm	Weight/mass measures ton - t quintal - c kilogram - kg gram - g milligram - mg
Area measures (square measures) sq. kilometer - km 2 hectare - ha sq. meter - m 2 sq. centimeter - cm 2 sq. millimeter - mm 2	cube meter - m 3 cube decimeter - dm 3 cube centimeter - cm 3 cube millimeter - mm 3
Measures of time century - in year - g month - m or months week - n or week day - s or d (day) hour - h minute - m second - s millisecond - ms	Measure of vessel capacity liter - l

Measuring instruments

Special measuring instruments are used to measure various quantities. Some of them are very simple and designed for simple measurements. Such instruments include a measuring ruler, tape measure, measuring cylinder, etc. Other measuring instruments are more complex. Such devices include stopwatches, thermometers, electronic scales, etc.

Measuring instruments usually have a measuring scale (or scale for short). This means that there are line divisions on the device, and next to each line division the corresponding value of the quantity is written. The distance between the two strokes, next to which the value of the value is written, can be additionally divided into several smaller divisions; these divisions are most often not indicated by numbers.

It is not difficult to determine what value each smallest division corresponds to. So, for example, the figure below shows a measuring ruler:

The numbers 1, 2, 3, 4, etc. indicate the distances between the strokes, which are divided into 10 identical divisions. Therefore, each division (the distance between the nearest strokes) corresponds to 1 mm. This quantity is called at the cost of a scale division measuring device.

Before you begin measuring a value, you should determine the scale division value of the instrument you are using.

In order to determine the division price, you must:

1. Find the two closest lines on the scale, next to which the values ​​of the quantity are written.
2. Subtract the smaller number from the larger value and divide the resulting number by the number of divisions between them.

As an example, let’s determine the price of the scale division of the thermometer shown in the figure on the left.

Let's take two lines, near which the numerical values ​​of the measured value (temperature) are plotted.

For example, bars indicating 20 °C and 30 °C. The distance between these strokes is divided into 10 divisions. Thus, the price of each division will be equal to:

(30 °C - 20 °C) : 10 = 1 °C

Therefore, the thermometer shows 47 °C.

Each of us constantly has to measure various quantities in everyday life. For example, in order to arrive at school or work on time, you have to measure the time that will be spent on the road. Meteorologists measure temperature, barometric pressure, wind speed, etc. to predict the weather.

When solving geometric problems, students are faced with the question: how to correctly designate certain parts of the drawing? For example, the height of the triangle, the width of the rectangle, the dimensions of the pool. We will find similar notations and in physical problems: the length of the pendulum, the height from which the body begins to fall... Therefore, you should know some rules.

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What are the different parameters?

The unified measurement system uses the designation with Latin letters:

• length - letter l , if we are talking about one straight line: a pendulum, a lever, a segment, a straight line. But if we are talking about a geometric figure, for example, a rectangle, then A is used;
• height or depth - h ;
• width - B.

Students learn what the SI system is only in high school, so usually in lower grades special notation for these quantities is not introduced.

How to indicate depth?

Why is the same letter used for height and depth? If you draw a parallelepiped, here you will mark the height of the figure.

And if you draw a drawing of a rectangular pool of the same size as the parallelepiped, then the depth is indicated. Thus, we can say that the height and depth in this case will be the same value.

Attention! Height and depth are two quantities that denote the same thing, connecting two opposite planes.

The concept of “depth” is also found in geography. It is shown in color on maps. If we are talking about expanses of water, then the darker the blue color, the greater the depth, and if we are talking about land, then the lowlands are indicated by dark green.

In drawing, this value is denoted by the letter S. It allows you to create a complete perception of an object, sometimes even with just one view.

What happens is long

What is length and how is this indicator designated? She points distance from point to point, that is, the size of the segment. In geometric problems it is usually denoted as A. In stereometry it can be denoted by both A and l (for example, in problems where there is a line intersecting a plane).

In physics, the length of a pendulum, lever arm, etc. in “Given” is indicated by the letter l , since we are talking about a separate straight line.

The difference between length and height

Length is a quantity that characterizes the length of a line.

And the height is perpendicular to the opposite plane.

That is, we can conclude that the length differs from the height in that it is part of the figure, coinciding with its edge, and the height is obtained as a result of additional construction in the drawing.

Height is carried out in order to obtain new data for solving problems, as well as new figures as part of the original one.

This is the width

The width of an object is necessary to understand the shape of both 2D and 3D objects. As a rule, it is denoted by the letter B.

Width is measured in meters (SI). But if the object is too small, then smaller units of measurement are used for convenience:

• decimeters,
• centimeters,
• millimeters
• micrometers, etc.

And if the subject too big, then the following prefixes are written:

• Kilo (10³),
• Mega- (10 6),
• Giga- (10 9),
• Tera- (10 12), etc.

Of course, such large units of measurement are necessary, for example, for astronomy. They are also used in quantum physics, microbiology, and so on.

What are the sides of a rectangle called?

Unlike a square, the sides of a rectangle pairwise equal and.

This means that the forming sides are different.

Typically, the longer side of a rectangle is called the length, and the width of a rectangle is its short side.

Important! Knowing data such as the length and width of a rectangle, you can find its perimeter, area, length of the diagonals and the angle between them. You can always describe around a rectangle. These properties also work in the opposite direction.

What are the SI dimensions of length, width and height measured in?

According to the unified measurement system, length, height and width are measured in meters. But sometimes, if it is a fractional or multi-digit number, multiple units of measurement are used for convenience in calculations.

In order to know how to correctly convert units of measurement into larger or, on the contrary, smaller ones, you need to know meanings of prefixes.

• Deca - 10 1,
• Hecto - 10 2,
• Kilo - 10 3,
• Mega - 10 6,
• Giga - 10 9,
• Deci – 10 -1,
• Santi – 10 -2,
• Milli – 10 -3,
• Micro - 10 -6,
• Nano – 10 -9.

After calculations these units must be converted to meters.

There are also non-systemic units, but they are very rare.