The amount of Land and other key parameters

Very often we Willy-nilly think about, it would seem strange and meaningless questions. We are very often interested in the numerical values of some parameters and comparing them with others, but known quantities. Very often, these questions come to mind children, and parents have to answer them.

What is the volume of the Earth? To answer the question it is not easy, because the brain is very reluctant to remembers those values which he rarely will have to apply in life. If you heard the answer to this question a long time ago, today you can hardly remember it, as it is with you that time is not useful.

Before giving the exact answer and the comparison result of the volume of the Earth with known values, delve into the history of geometry. Because this science was originally created to measure different characteristics of our planet.

History

Geometry originated in Ancient Egypt. People are very often required (as now) finding distances between cities, measure certain objects, measure the area of land owned by them. Thanks to all that appeared a special science - geometry (from the words "geo" - Earth and "metros" - measure). And initially it was limited only to applications. But for some of the measurements required more complex calculations. Then came the early development of this science such philosophers and scientists as Pythagoras and Euclid.

Under construction even at first sight a simple construction must be able to measure what quantity of material will go to the building, to calculate the distances between points and angles between the straight planes. Also need to know properties of simple geometric figures. Thus, the Egyptian pyramids, built in 2-3 century BC, affect the accuracy of their spatial relations, arguing that their builders knew many geometric terms and had a great base for accurate mathematical calculations.

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Then, with the development of geometry it has lost its original purpose and expanded the area of its application. It is impossible to imagine any production without calculations by using geometric methods.

In the next section will discuss methods of measurement of certain geometric characteristics for different kinds of bodies.

Measurement of solids

For rectangular solids measuring the volume and the area most simple. You only need to know the width, length and height of the shape to learn about it everything you need. The volume of a rectangular body is the product of three spatial variables. The area of this figure equal to twice the sum of the pairwise products of the parties. If you imagine these formulas mathematically, the amount is fair is the equality: V=abc, while for the square: S=2(ab+bc+ac).

But the globe, for example, these formulas are very uncomfortable. To calculate the diameter of the ball (of radius), you need to enclose it in a cube, with whom he was in contact at six points. Length (width or height) of the cube is the diameter of the ball. But it is much easier to find the volume of a ball, dipping it in filled to the brim of the vessel. By measuring the resulting volume of water we know the volume of a sphere. And since the formula for volume of a sphere V=4/3*π*R³, from it we can find the radius, which will help to find further characteristics of the body.

There is another interesting way of measuring the volume of a sphere, which we describe in the next section.

How to measure the volume of the Earth?

And if the body is too large, for example, the planet, how to measure accurately its volume and surface area? You have to resort to more interesting and sophisticated methods.

Let's Start from afar. As you know, if you imagine a ball in two-dimensional space, you get a circle. Suppose that from some point on the sphere is falling in two different places close to each other two beams. If you look closely, you will see that they fall to the surface at different angles. By simple geometry you can see that from the center of the ball can draw a line connecting these two points. Between these lines will form a certain angle, which is measured in advance to correspond to the distance between these points. Thus, we know the length of the arc, corresponding to any corner. As just a circle of 360 degrees, we can easily find the circumference of a circle. And from the formula of circumference of a circle find the radius from which the well-known formula to calculate the volume.

This method is the large volume of bodies, including the celestial. Them in ancient times was used by the Greeks to find more data about the Earth. So they calculated the volume of the Earth. Although these figures are rough, because there are many errors that are overlooked with this method of measurement.

Before giving the answer to the main question, let us consider the measure such complex variables with the smallest possible error.

Modern measurement methods

Today, we have a lot of advanced technology that allow us to Refine the calculations of the ancientsscientists about different characteristics of Earth. To do this, in the last century, mankind has used orbiting satellites. They can with the greatest accuracy, measure the circumference of our planet, and on the basis of these data to calculate the radius, knowing that, as we have seen, it is easy to find the volume of the Earth.

It's time to get an exact figure and compare it with the known values.

What is the volume of the Earth?

So, we approached the main question of this article. The volume of the Earth is 1 083 000 210 000 km< / span>³. A lot of it? Looking to compare. Of those facilities that we are able to compare with this value, is only another heavenly body. Thus, we can say that the volume of the moon is only two percent of the earth.

There are also planets, such as Jupiter that have a huge amount of due to the fact that they have a low density and a large surface area. The volume of the Earth could also be more, if it consisted mostly of gases, but not solids and liquids.

Usage

Such values we need rather to interest. But in real life they are used very actively. In astronomy such values as the volume of the Earth, the mass of the Earth, the earth radius, is used to calculate the orbits of satellites launched from the surface of our planet. Also, these data can be useful for more basic research. Interestingly the use of this data in geography and Geology, because the calculation of the volume of the Earth is of interest for geological exploration and rough estimates of a mineral Deposit.

Error

As you know, there are always errors. In the calculation of the volume of Land a lot of them. More precisely, only one error contributes to the measurement, but it is the most significant. It consists in the fact that the Earth is not perfectly round. It is flattened at the poles and also has surface irregularities in the form of valleys and mountains. Although the planet is covered with atmosphere, and most of these effects affect the measurements, smoothed, the density measurement is very difficult.

Conclusion

Physical characteristics of the Land has always been quite an important theme for everyone. It happens that for some reason, but I want to know the answer to the question about how many percent of the area of the planet is the oceans or what is the volume of the Earth. In this article, we tried not only to give a precise answer, but to tell how and with which it was calculated.