10th Class Physical Science - Question Bank
How do you appreciate the role of the
higher specific heat of water in
stabilizing atmospheric temperature
during winter and summer seasons?
The sun delivers a large amount of
energy to the earth daily. The water
sources on earth, particularly the oceans,
absorb energy for maintaining a relatively
constant temperature. They can absorb
large amounts of heat at the equator
without rise in temperature due to high
specific heat of water. Therefore oceans
moderate the surrounding temperature
near the equator.
Also ocean water transports the heat
away from the equator to the polar
regions. This transportation helps in
moderate the temperature or climates in
the areas that are far from the equator.
The water in oceans can stabilize the
temperatures on earth in winter and
summer seasons.
What role does specific heat play in
keeping a watermelon cool for a long
time after removing it from a fridge on
a hot day?
If specific heat is high, the rate of rise or
fall in temperature is low. So watermelon
takes long time to rise in its temperature.
Hence Watermelon brought out from a
fridge retains its coolness for a long time
than other fruits. Because the watermelon
consists of more water and water has
greater specific heat value.
If you are chilly outside the shower
stall, why do you feel warm after the
bath if you stay in the bathroom?
After bath, the number of vapour
molecules per unit volume in the bath
room is greater than the number of vapour
molecules per unit volume outside the
bath room. When we try to dry ourselves
with towel, the vapour molecules
surrounding us condenses on our body.
Hence we feel chilly (warm) after bath as
condensation is a warming process.
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