This article has a total of 3 picturesLooking at the night sky, the stars are twinkling. Well, think about the picture must be beautiful.
What? You said that the smog is too big to see? Cough, this is nothing to do with me, in short, imagine the starry night sky. Those shining stars, those actually burning by distant stars, the stars closest to us are the sun we see every day.
Why do you want to mention the sun? We know that when a general object burns, it needs oxygen. But how does the sun burn in the universe in a near-vacuum environment?
[Sad laughter] In fact, it is intentional to introduce you into the pit, because in fact, the "burning" of the sun at this time is different from the burning on the earth. What happens in the sun is actually nuclear fusion . That's right, the principle of hydrogen bombs is related to this. To learn more about how the sun burns, please move to the universe without oxygen. Why does the sun burn out? - Physics - Knowing
Why do I talk about the fusion of the sun? Because the reaction on the sun is related to this theme. The sun is a huge, burning "hydrogen balloon". The sun consumes 600 million tons of hydrogen (H) per second , transforming it into the second element He (He). What is the resulting enthalpy? 596 million tons. Huh? Does the quality seem to be reduced? Where is the quality of this lost part?
According to Einstein's famous formula
The quality of the loss is transformed into energy, scattered to the surroundings, then how much is it finally falling to the earth? About 1.59 kilograms. The energy released by the mass of 1.59 kilograms per second gives us warmth and light. It makes the natural society prosper.
For the "burning" of the sun, the extra thing to say is that the "burning" of the sun is not a chemical reaction. why? Let's take a look at the definition of a chemical reaction: the process by which a molecule breaks into atoms, and the atoms rearrange and combine to form a new substance. That is to say, the smallest unit of chemical reaction is the atom, and can no longer continue to divide. The reaction that occurs on the sun is that the hydrogen nuclei become polynuclear. The smallest unit at this time is the nucleus, not the atom, so it is not a chemical reaction.
The sun's astounding consumption of hydrogen raises everything on earth, and hydrogen is indispensable in our lives. The water we drink is made up of hydrogen and oxygen. In the early years, there was a hydrogen peroxide. Prank , if you are interested, you can go and search.
Returning to the sun, the sun is burning, thousands of degrees of high temperature around it, it is impossible to get close to take a small piece to study its composition, then how do we know the composition of the sun is more divided?
This is another magical thing: atomic emission spectroscopy. When an element is heated to an extremely high temperature, they emit light or a color of a characteristic wavelength. The divergence spectrum of each element is like an ID number, and an element corresponds to a divergent spectrum, which is not chaotic. By analyzing the spectrum, we can easily determine the composition of it.
It is worth mentioning that it is people who have measured the composition of the sun and found the element He (He), which is named after the Greek sun god. (氦 is English for helium, the name of the sun god is Helios)
Finally, the spectrum of the hydrogen atoms
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