Posted by shweta on Sunday, September 12, 2010 at 2:44pm.
Water reaching an ocean beach is mostly at or near the temperature the deeper water offshore, which has a high heat capacity and does not cool off much overnight, nor get as hot as the land during summer days. In other words, in summer the ocean is colder than land in the daytime.
The sand at the beach is effectively heated by sunlight passing through the water. (Water near the surface is not as efficiently heated because of ts transparency). Because of the low thermal conductivity of sand, the energy absorbed from sunlight only has to heat a thin layer near the surface. The sand surface at a shallow shoreline is closer to the hot air temperature, although the waves help cool it down somewhat.
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