The explanation for all this is given by Carbonel, it is he who explains that the particles fall under the tremors from all sides, which causes their chaotic movement. And the smaller the particles, the more active their movement becomes, since the shocks throw them away more and more, and if the bodies are large, then the number of shocks from all sides somehow becomes almost equal, so furniture, buildings and people themselves do not vibrate by themselves and Brownian motion is not observed. It also turns out that as much as the temperature is higher, so is the velocity of these particles.
This picture becomes even clearer when Richard Sigmondi managed to invent his ultramicroscope, on the basis of which even smaller particles could already be seen. And their movement was no longer a simple movement, it was flickering, jumping and splashing, as Sigmondi himself would describe. But in order to better see this picture, the Svedberg method helped, which reduced the time of the passage of light into the microscope, thanks to which it was possible to fix exactly the specified moment, that is, it was possible to photograph this movement. And with a decrease in the time interval, doing less and less, it became possible to reach the moment when the particles in the photo simply froze in place.
And finally, the year 1908 comes, when it was finally established that atoms exist, have mass and are the basic units of matter, and combining with each other form molecules – particles of any complex compound, be it water, acid, the human body, etc.
So, Jean Perrin, a French physicist, decides to study atoms and finds a very amazing way to do it. He takes a drop of gummigut, pieces of rubber resin or yellow paint, if you like. By rubbing this piece in water like a bar of soap, he got yellowish water. But when he took a drop and examined it with a microscope, it turned out that the gummigut was not completely gone, but simply divided into thousands and thousands of small particles of different sizes. Perrin decided that if they are of different sizes and all these are gummigut particles, then they have different masses, therefore, they can be separated using a centrifuge. That is, if you rotate this liquid, then the heavier particles will logically separate to the wall, and the lighter ones will remain.
And with increasing speed, the force increases not twice, but as many times as the speed increased, due to the second degree in the centripetal acceleration formula. Consequently, Mr. Perrin could easily claim that he could separate heavy particles from light particles by strong rotation and he used a centrifuge for this, the same device that rotated with a certain frequency without spilling all the liquid. Perrin used a centrifuge, which thus rotated 2500 times per minute. And even then, only in a small part of the center, places with homogeneous particles were formed, and the rest flew to the edges. Therefore, Mr. Perrin had to use the centrifuge like this several times. Even taking into account the fact that this centrifugal force, even at a radius of 15 cm, already exceeded the force of gravity (the force of gravity of the Earth) by 1,000 times. What can be seen, given that gravity is determined by the product (multiplication) of mass by the acceleration of the fall of any object g, which is the same for all objects and is equal to 9.81 m/ s2 (meters per second squared). And based on the fact that 2500 revolutions per minute are performed, it can be calculated that the angular acceleration according to (1.1).
It remains only to calculate the ratio and get the result (1.2).
The resulting number is indeed more than 1,000, that is, the force at a distance of only 15 cm is already greater than the force of attraction of the entire planet by 1,046.9 times. Thus, in the end, Perrin managed to obtain water only with the specified particle diameters – 0.5 (5 out of 10 parts), 0.46, 0.37, 0.21 and 0.14 microns (1 thousandth of a millimeter or 10-6 m, which corresponds to a division of 1/1000000). And finally, having obtained such liquids only with a certain type of gummigut particles (such liquids are called emulsions), Perrin decided to experiment and observe them in a microscope. Watching them, turning the entire cuvette on its side, Perrin noticed that these particles decrease with increasing height. If at first they filled the entire liquid evenly or randomly, then they decreased with height, just as the air in the upper layers of the atmosphere decreases. And that was already a thought! If we compare this with the decrease in air at high altitudes, then we can establish a pattern. But in order to check it, Perrin decided to count these grains at each height.
Alas, it was not possible to photograph them, because the photos were not too clear due to the small size of less than 0.5 microns, and Perrin measured the number of gummigut particles several times at different heights, since the particles were moving, it was not possible to accurately count, so Perrin had to count several times even at the same height, and then say the average number. So at one time, he carried out the calculation at a height of 5, 35, 65 and 95 microns. And it turned out that the number of particles at a height of 35 microns was equal to almost half of the number of particles at a height of 5 microns, and at a height of 65 – half of 35, etc. And this already perfectly fell under the law of reducing atmospheric pressure (the force of oxygen pressure on our planet) with an altitude that was determined by Blaise Pascal, the famous French scientist, back in the 17th century. He measured the amount of oxygen using the Torricelli barometer, a pressure measuring device, the principle of which is that at normal air pressure from above, the mercury in the tube is at a certain height, when the pressure becomes less, the mercury can rise, and if the pressure increases, then vice versa – decreases, if there is no pressure, like gravity, it is a kind of weightlessness. Having calculated the difference in the layers of the atmosphere, Pascal even then determined that oxygen decreases with increasing altitude for every 5 km. But why is there a 2-fold decrease in gummigut particles only from 5 to 35, and in the atmosphere from 5 to 10, even if we do not take into account the scale?
And it's all about the particles, because there is oxygen in the atmosphere, and here the gummigut particles are so large that they can be seen in a microscope, their diameter is 0.21 microns. The law also changes for nitrogen, carbon dioxide, etc. due to the difference in the masses of the molecules. And if we consider the e4tu emulsion as a small atmosphere, then it is already possible to calculate the real mass of the atom! It is not so difficult to make this calculation, the height at which the oxygen density becomes 2 times less is 5 km, and for gummigut – 30 microns. And 5 km is 165,000,000 times larger than 30 microns, therefore, 1 such gummigut ball with a diameter of 0.21 microns is 165,000,000 times larger than an air molecule. And it's easier to calculate the mass of this gummigut ball.
The ratio of the mass of 1 cubic meter of gummigut (in the volume of a cube with dimensions of 1 meter wide, 1 meter high and 1 meter long) to its mass is the same as that of this gummigut ball and is equal to 1,000 kg/m3 (kilograms per cubic meter) or 103 kg/m3 (10 in a cube). And the volume of the sphere for the gummigut ball is also simple. After all, in order to calculate the volume of the sphere, it is necessary to circle the circle in space, that is, multiply by its area, the area of the second circle, and then it will turn out and at the same time subtract the part of the circle where such a «revolution» went 2 times. As a result, a formula is derived similar to the formula for the area of the circle (1.3).
This volume corresponds to the mass, taking into account the force of Archimedes, that is, the force that pushes out of the water, since the gummigut particles are in the water, and not in the air, is about 10-14 grams. And if this grain is 165 million times larger than the oxygen molecule, therefore, the mass of the oxygen atom is 5.33 * 10-23 grams. And this is already, as can be learned from comparisons of the masses of hydrogen and oxygen (taking into account that there are 2 atoms in the oxygen molecule, since it is a gas) 32 times more than the mass of hydrogen, therefore, the mass of the hydrogen atom is 1,674 * 10-27 kg, that is, 1 gram of hydrogen already contains 597,371,565,113,500 597 371 565 114 hydrogen atoms! And so, it was already possible to compare the mass of the atom with A. E. M., having obtained that the mass of the hydrogen atom is 1.007825 A. E. M. It was in this way that Perrin was able to do the seemingly impossible – to weigh atoms and molecules, and now atoms and molecules were not a fairy tale, but a real science with precise calculations, formulas