When a hot molecule reaches a cold one, the
hot one gets a little colder, and the cold one
gets a little hotter.
Saying that one molecule (I'll call it
molecule A) is hot compared to another
molecule of the same kind (I'll call it
molecule B) means that A has more energy
than B. If you want a rough picture of this,
you can think of A as a rolling ball and B as a
stationary ball. If ball A hits ball B, ball B
will start rolling a bit, and ball A will slow
In the same way, molecule A reaching molecule
B results in a transfer of some of its
energy, so molecule A gets colder (slows
down), while molecule B heats up (starts moving).
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