回复: "一把荔枝三把火“如何翻译？
Eating one Lychee will cause a rise of "heat" in your body.
[SIZE=+2]Why does
heat rise?[/SIZE]
(Lansing State Journal, April 24, 1996)
Because
heat is not matter, it isn’t correct to say it rises or falls. A better way to ask the question is: "Why do hot things (like hot air)
rise above cold things (like cold air)?"
To answer this question, it is important to understand what
heat is.
Heat is energy. When we say something is hot, we really are saying it has a lot of stored energy.
What does this energy do?
Matter is made up of incredibly small pieces called atoms and molecules. Atoms and molecules are always moving.
The more energy these atoms and molecules have, the faster they move. The faster they mover, the more space they take up.
If something is hot, it weighs the same as if it were cold, but it just takes up more space.
This leads us to the concept of density. Because hot air takes up more space than cold air, hot air has a smaller density. Less dense hot air will "float" above the more dense cold air.
