A small patch of garden is bathed in sunlight. The sun is transferring heat to this garden by...

Question:

A small patch of garden is bathed in sunlight. The sun is transferring heat to this garden by radiation, but the garden's temperature remains essentially constant. Why doesn't the garden get hotter and hotter?

The amount of direct sunlight is minimal

Shade retains heat better

Soil conditions

Vaporisation

Heat Transfer:

It is the method in which transfer of the thermal energy takes place due to the fluctuation in temperature of two objects or medium. In nature, the transference of thermal energy takes place from high temperatures to low temperatures.

The heat transfer can be done in the three types which are as follows-

  • Heat transfer by Conduction.
  • Heat transfer by Convection.
  • Heat transfer by Radiation.

Conduction- The heat transfers takes place between the solid substances.

Convection- The heat transfer takes place between the mediums of different temperatures.

Radiation- It is the process of the emission of the waves of the electromagnetics which is in the form of energy.

Answer and Explanation:


The temperature of the ground does not change because the value of the heat gained by the radiation from the sun is the same as the amount of heat loss released by re-radiation from the ground. This heat loss happens because the heat is used to vaporize water from sprinklers and this makes the temperature of the garden patch stable.

Thus, the unchanged temperature is caused partly due to the process of the vaporization but it is not the only reason. It is caused by the factor mentioned above.


Re-radiation: Reradiation is defined as the process of reverting the radiation waves to space for maintaining the temperature of the earth from being more hotter. If the process of re-radiation does not take place, then the value of the temperature of the planet will increase severely. The quantity of the re-radiated waves is susceptible so, it will be maintained in such a way that the amount of this will be in a safe manner to maintain safety purposes.



Learn more about this topic:

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Thermal Expansion & Heat Transfer

from High School Physics: Help and Review

Chapter 17 / Lesson 12
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