Question
Which of the following is a process in which hot, less dense materials rise upward and are replaced by colder, more dense materials?
This question was previously asked in
SSC CGL 2020 Tier-II (English) Previous Year Paper (29-Jan-2022)
The correct answer is
Convection
The correct answer is Convection.
Key Points
- Convection is a mode of heat transfer by the actual motion of matter.
- Convection is a process in which hot, less dense materials rise upward and are replaced by colder, more dense materials.
- Convection is possible only in fluids.
- Convection can be either be natural or forced.
- Gravity plays a major role in natural convection.
- Material is forced to move by a pump or by some other physical means in forced convection.
- Forced-air heating systems in the home, the human circulatory system are the common examples of forced convection.
Additional Information
- The three distinct modes of heat transfer are:
- Conduction.
- Convection.
- Radiation.
- The process of heat transfer without any medium is called radiation.
- Conduction is the process of heat transfer between two adjacent parts of a body due to their temperature difference.
- Condensation is the process where water vapor becomes liquid.
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