Is the cold air on it or the hot air on it when the air conditioner is turned on?

Hot air, because the carbon dioxide that the human body has breathed is exhaust gas, it will rise, and the air conditioner will freeze some factors in the air, it will be wet, so it will fall down. In this way, hot air is above the house and cold air is under the house.

When the air conditioner in the room is turned on, the air in the upper part of the room is always relatively hot, while the air at the bottom of the room is cooler.

Because for the air in the space, the higher the temperature, the lower the density, the lower the temperature, the higher the density, the higher the density of the air will naturally convection to the lower part of the space.

Therefore, when using the air conditioner, the heating mode needs to let the air conditioner indoor unit blow air diagonally forward and downward, and the cooling mode needs to let the air conditioner indoor unit blow air diagonally forward and upward. Qi is just below.

Categories: Science & Engineering.

Problem description: In the atmosphere, it is hot and cold near the ground.

Analysis: The cold air in the air-conditioned room sinks and the hot air rises.

And in the atmosphere, it should be macroscopically speaking, it is near-surface heat, because we are in the troposphere, just like the second floor said that every 100 meters above sea level, the temperature drops, and in fact, it is because of this that convection can be generated.

You have to know that the air-conditioned room is a small area of space that is close to sealing, and the atmospheric troposphere is a large range of space, so the two concepts are completely different and not comparable.

Or you can understand it this way, the space in the room is small, so the speed of convection is also fast, so the cold air sinks after a while when the air conditioner is turned on, and the process of hot air rising is completed. The convection of the atmosphere is microscopic and different.

The air conditioner of the air conditioner is sinking, so turn on the air conditioner to let the air outlet go up, which will make the room cool faster.

Hot air, to put it simply, cold air is heavier!!

Hot air is in the upper part of the interior space.

The higher the air temperature, the less dense the air is, and conversely, the lower the temperature, the greater the density. Therefore, hot air with higher temperatures will naturally flow to the upper part of the room and cold air will naturally flow to the lower part of the room.

Therefore, when using air conditioning for cooling and cooling, try to let the indoor unit blow air diagonally in front and up, and try to let the indoor unit blow air diagonally in front and down when using air conditioning for heating, so as to make the temperature in the room as uniform as possible.

The hot air is light and will float automatically, so the cold is on the bottom and the heat is on the top.

Reason: The density of cold air is relatively large, so the cold air is below; Hot air is less dense, so hot air is on it.

Analysis: Because the air has the nature of thermal expansion and contraction, the air temperature is high, the molecular movement speed is fast, and the molecular spacing is large, that is, the volume becomes larger, so the density of the air is small, that is, the air pressure is low and the mass is small, so it will float above the air with large mass and high density. On the other hand, cold air is densely populated by low temperatures and is located below hot air.

As a result, the cold air stream sinks and the hot air rises.

The Kong Ming lanterns and hot air balloons in life are all flying with this principle.

Hot air has a low density, cold air has a high density, the low density rises, and the dense air decreases. So the cold air is below, and the hot air is above.

The molecules of warm air are more active, so the volume is larger, and the warm air is less dense than cold air and naturally floats to the top. (Keep in mind that density refers to the mass per unit volume).

Cold air is small in volume and dense, and hot air is large in volume and low in density.

Because the density of hot air is smaller than that of cold air, it is hot at the top and cold at the bottom in the air-conditioned room; The heat in the atmosphere is the heat of the sunlight absorbed by the ground and then transferred to the atmosphere (air conditioning is to directly heat the air), so the closer to the ground, the hotter, and because the space is large, the air convection can not be as violent as in the air-conditioned room, plus the atmosphere above is thin, so the top is cold and the bottom is hot!

In the comparison of cold air, it is generally below.