It is precisely physics that can be considered a science not only interesting, but also fundamental – this is an indisputable fact. She studies the universe itself and tries to unravel the most complex secrets of nature, despite the complexity of such research. However, science is developing from year to year, and progress is accelerating, so that the most important new discoveries are probably not far off.
To overcome the speed of sound is not as difficult as it seems. The tip of an ordinary whip moves so fast that it is ahead of the sound. It is at the moment of their transition to the sound barrier that the cotton is heard. Once physicists were surprised to learn that the lightning discharge temperature is about five times higher than the surface temperature of the sun. As is well known, various substances, not only gaseous ones, are compressed from exposure to high or low temperatures. For example, the height of the Eiffel Tower can fluctuate within 12 centimeters depending on the weather, as the metal heated by the sun expands.
The sun appears red in the morning and in the evening due to the fact that its rays at this time pass through the lower layers of the atmosphere, saturated with dust and other particles. And outside the atmosphere, all the stars, including the Sun, in the visual spectrum in general look white. Physicists still do not know why hot water freezes faster than cold water. Ordinary matter accounts for about 5% of the mass of the observable universe. Another 22% is accounted for by dark matter, about which almost nothing is known so far.
One of the most prominent physicists of the 20th century was Albert Einstein. Many of his theories are still being developed by modern scientists. For the first time, scientists managed to create antimatter in 1965. Apparently, antimatter is not found in the natural state in our Universe, but it can be obtained in the laboratory. Such an interesting phenomenon as the northern lights, occurs when the solar wind interacts with the upper layers of the Earth’s atmosphere. Physicists have long solved this riddle. Liquid is not only the usual, familiar to us, but non-Newtonian. As an example, one can cite, for example, quicksand.
The speed of sound propagation directly depends on the density of the medium. So, in water or granite massif it will be higher than in the air. Among other interesting facts about physics, one cannot but mention that the density of water directly depends on its temperature. The maximum density is reached at +4 degrees, and the frozen ice is even less dense than water, therefore it floats in it, and does not sink.
