If hot air goes up and cold air goes down, why does a horizontal freezer loses cold when opened?
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It’s too simple to say hot air “goes up” and cold air “goes down.” Hot air is less dense and cold air is more dense. That means they tend to go up and down respectively, but in the case of a horizontal open freezer, it’s a little different.
The cold air in the freezer suddenly has more room to spread into and “go down” to the floor level. So in the same way that a freezer full of liquid water would spill out when you open the door, the cold air spills out. Warm air from the room replaces some of it, and until the temperature inside evens out again, it will be slightly warmer in the upper part of the freezer.
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