Quotation from: General Science

Written by: Bertha M. Clark


30. Heat Needed to Melt Substances. If a spoon is placed in a vessel
of hot water for a few seconds and then removed, it will be warmer
than before it was placed in the hot water. If a lump of melting ice
is placed in the vessel of hot water and then removed, the ice will
not be warmer than before, but there will be less of it. The heat of
the water has been used in melting the ice, not in changing its
temperature.


If, on a bitter cold day, a pail of snow is brought into a warm room
and a thermometer is placed in the snow, the temperature rises
gradually until 32 deg. F. is reached, when it becomes stationary, and the
snow begins to melt. If the pail is put on the fire, the temperature
still remains 32 deg.F., but the snow melts more rapidly. As soon as all
the snow is completely melted, however, the temperature begins to rise
and rises steadily until the water boils, when it again becomes
stationary and remains so during the passage of water into vapor.

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