At the beginning of 2121, many domestic chefs were born. Modern people have been less and less exposed to the great job of cooking in their busy lives, but this holiday, through their own personal practice, many people have learned some tips in the kitchen, such as how to make cakes and steam steamed buns. Then steaming steamed bread in a steamer is the first ripening. Do you know what the physical basis is? This is actually related to the physical characteristics of water vapor, which will move upward, so the steamed bread in the steamer above is cooked first.

the density of steam is very small, and the steam contains a lot of heat, and the temperature is very high. It is physical common sense that hot gas moves upward. When the water under the steamer is boiled and vaporized at high temperature, the steam will reach the top steamer all the way up, and the closer it is to the steamer below, the less temperature will be obtained, so the steamed bread above will be cooked first. In fact, this situation is not uncommon. When we do the experiment of mixing hot and cold water, we dye water with different temperatures into different colors. After mixing the two, we will find that most of the colors represented by hot water gather in the upper part, and it will tend to be stable after a period of time.

This physical property of water vapor is related to its density. When the density is less than air, it will rise, just like our common hydrogen balloon. In fact, this situation is because the pressure on the ground is greater than the pressure of water vapor, which leads to the rise of water vapor. When the water vapor is rising, it gradually cools down due to the influence of heat transfer, and the pressure will change slightly when the poster rises. When the two pressures reach equilibrium, the movement of water vapor will tend to be stable.

Because of the upward movement of steam, the food on the upper floor is cooked first, but it is precisely because of this characteristic that it brings us some convenience. The steamed bread on the upper floor is cooked first, which is also convenient for people to eat, especially in large-scale restaurants, which saves time and cost. Not only that, we also reduced the probability of scalding when taking the upper steamer.