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Elements, Compounds and Mixtures
Solid, Liquid and Gas - Melting and Boiling (continued).
At the boiling point, the temperature of a liquid
does not
change until all the liquid has
boiled and become gas.
During this time, the extra heat energy goes into
overcoming the force of attraction
between the particles of the
liquid.
The temperature of a liquid can not be
raised above its boiling
point
at atmospheric
pressure.
The same
graph (as the previous page) occurs on cooling
a gas to a liquid, or a liquid
to a solid.
The process of melting or boiling requires extra energy - it is endothermic.
The process of freezing or condensing gives out energy - it is exothermic.
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