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Answers
Difference between Isolation and Terrestrial radiation.
Isolation :
¤ Insolation is the process by which the solar radiation is intercepted by the earth.
¤ It is a measure of the solar energy that is incident on the surface of the earth for a particular set of time.
¤ Insolation travels in short waves.
¤ Insolation is measured by the amount of solar energy received per square centimetre per minute.
¤ There are several factors that affect Insolation. They are: solar constant, angle of incidence of sun’s rays, duration of the day and others
Terrestrial radiation :
¤ Terrestrial radiation is defined as the radiation that goes back to the atmosphere and the space.
¤ In Terrestrial radiation 34 units are transferred to the atmosphere and 17 units go back to space.
¤ Terrestrial radiation occurs through long waves. 51 units out of 100 units of solar radiation are involved in isolation.
¤ Terrestrial radiation is measured using the Precision Infrared Radiometer.
¤ The factors which affect Terrestrial radiation are surface reflection, solar elevation, aerosols, air pollution etc.
Difference between radiation and convection.
Radiation :
¤ In radiation, heat transfer occurs through electromagnetic waves without involving particles.
¤ The heat transfer occurs in all objects with a temperature greater than 0 K.
¤ The heat transfer in radiation is the fastest.
¤ The heat transfer occurs through electromagnetic waves.
¤ It follows the law of reflection and refraction
Convection :
¤ In convection, the heat transfer takes within the fluid
¤ The heat transfer occurs due to the difference in density.
¤ The heat transfer in convection is faster.
¤ The heat transfer occurs through intermediate objects. For example, heat transfer between air and water
¤ It does not follow the law of reflection and refraction