Which of the following is a process in which hot, less dense materials rise upward and are replaced by colder, more dense materials?
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.
Similar Questions
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The coil of wire in an electric room heater or electric cooking heater is called _______.
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The melting point of ice is ____ K.
Which statements about thermodynamic processes and heat engines is/are correct?
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2. Efficiency of an ideal heat engine depends only on reservoir temperatures.
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Important Questions from Heat and Transfer
In summer season, the top and outer surface of the house are painted white because:
What is the heat released by a heating filament rated 24 W when it is kept on for 6 seconds?
Space is left between logs of wood when they are burnt, so that:
On a hot summer afternoon, the tent made up of fabric will be preferred as white colour is:
The coil of wire used in electric heaters is called a/an________.
