Ff you open the door of a fridge, your feet will feel colder than the top of your legs. Use ideas about convection and particles to explain this.

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Solution

Cold air is heavier than warm air. When you open the door, the cold air falls out and pulls in warm air. This is noticeable when you enter an air-conditioned room. You can feel the cold air falling over your feet. Convection demands that temperatures equalize. So the warm air is drawn to the colder areas and vice-versa. So when the door opens the warm air naturally migrates to the colder conditioned area. This means the cold air must exit the fridge at the same rate

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