Why does hot water make steam? First, one needs
to understand what steam is. Steam is “very quick
evaporation of water”. Evaporation is when water
molecules at the surface of a container of water
have enough kinetic energy to leave the
Water is made of up many water molecules. If
you have an open glass of water. These molecules
are all bouncing around the glass, fairly well
packed. At the surface of the water, some of the
molecules will have enough energy to leave the
glass, entering the atmosphere. You can think
about it like each molecule is running about, if
it is running fast enough and at the surface it
can leave. As you heat the glass the number of
molecules with enough kinetic energy increases,
more evaporation occurs to the point where it is
visible, this is steam.
If you heat the water too much then it will
start to boil. At this point, all the molecules
have enough energy to be a gas and want to leave
the glass as quickly as possible.
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