Question??

Question

1) When you open the door on a cold day, does the hot air go out or the cold air come in?

Answer 1

Both. However, more air will move out, because the hot air is more active that the cold air.

Answer 2

Cold air comes in

Answer 3

Heat moves from hot to cold. If you touch a cold door heat moves from your hand into the cold door. If you touch a hot stove, the heat moves from the stove to your hand. Warm air rises because it is lighter than cold air. If the wind is blowing it can blow cold air in.
So as you open the door, wind may blow in.
warm air does rise out of the door.
there is some exchange of heat moving out.

If you stand barefooted by your refrigerator with the door open, you will feel the cold air falling out, it is heavier.

Answer 4

Both.... the hot air goes out and up. The cold air being heavier, more dense, tumbles in. Experiment: put a thermometer on the bottom of the door opening and one at the top....you'll see quite a difference as you open the door.

Answer 5

The HOT air goes out. You have to determine AVERAGE. Average for heat and cold is 55f. At this temperature Heat tries to go up and cold pulls away.

The heat in a room will attempt to heat the air outside. Although the air exchange may not change the BTU will drop. If the room was colder, the BTU from outside would rush in. LIKE AN ELECTRIC CURRENT, the conductor does not move but the force does.

Answer 6

Good question. You can test this idea with a candle. Warm air will flow out while cooler air from outside flows in. So both processes are at work. Since warmer air is less dense and more buoyant it will flow out over the colder inflowing air. Try the candle test.

Answer 7

Warmer air moves out at the top. Cooler air moves in at the bottom. Its called convection, and the movement constitutes a convection current.