Conduction is the transfer of heat energy from one substance to another or within a substance. Have you ever left a metal spoon in a pot of soup being heated on a stove? After a short time the handle of the spoon will become hot. This is due to transfer of heat energy from molecule to molecule or from atom to atom. Air conducts heat poorly, however.
Convection
Convection is the transfer of heat energy in a fluid. This type of heating is most commonly seen in the kitchen when you see liquid boiling.
Air in the atmosphere acts as a liquid. The Sun's radiation strikes the ground and warms it. As the Earth's temperature rises due to conduction, heat energy is released into the atmosphere. This forms a bubble of air which is warmer than the surrounding air. This bubble of air rises into the atmosphere. As it rises, the bubble cools with the heat contained in the bubble moving into the atmosphere.
As the hot air mass rises, the air is replaced by the surrounding cooler, denser air that we feel as wind. These movements of air masses can be small in a certain region, such as local cumulus clouds. They can also be large cycles in the troposphere that cover large sections of the Earth. Convection currents are responsible for many weather patterns in the troposphere.
Which two statements best describe the main ideas of the passage?
a.There are three ways heat is transferred.
b.Heat is transferred through the atmosphere.
c.Heat energy is transferred between molecules and atoms.
d. Solar radiation is absorbed by the atmosphere.
e.The atmosphere becomes cooler as air rises.
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Answer:
the statments:
1) the atmosphere becomes cooler when air Rises.
2) There are three ways heat is transferred.
describe best the main ideas of the passage
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