The number of units of heat required to melt a unit mass of ice is
called the _heat of fusion_ of water.
31. Climate. Water, in freezing, loses heat, even though its
temperature remains at 0 deg. C. Because water loses heat when it freezes,
the presence of large streams of water greatly influences the climate
of a region. In winter the heat from the freezing water keeps the
temperature of the surrounding higher than it would naturally be, and
consequently the cold weather is less severe. In summer water
evaporates, heat is taken from the air, and consequently the warm
weather is less intense.
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