When pure water is cooled to 0°C it changes state from liquid to solid, i.e. ice is
formed. Figure 3.2 shows the type of graph that is produced if the temperature
of the water is plotted against time during a temperature change from above
0°C to one below 0°C. Down to 0°C the water only exists in the liquid state. At
0°C solidification starts to occur and while solidification is occurring the
temperature remains constant. Energy is still being extracted from the water
but there is no change in temperature during this change of
state.
This energy
is called latent heat. The
specific ...
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