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
What is the unit of calorific value?
The coil of wire in an electric room heater or electric cooking heater is called _______.
At what temperature (in Fahrenheit) pure water freezes?
Which statements about thermodynamic processes and heat engines is/are correct?
1. Work done in irreversible expansion is greater than in quasi-static expansion.
2. Efficiency of an ideal heat engine depends only on reservoir temperatures.
3. Heat flows from cold to hot only with external work.
The melting point of ice is ____ K.
Which one of the following is a bad Thermal Conductor?
Why is it generally more severe to be burnt by steam at 100°C than by boiling water at 100°C?
Important Questions from Heat and Transfer
In summer season, the top and outer surface of the house are painted white because:
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________.
Transfer of heat by convection can take place in
A body in motion essentially acquires
A. Kinetic energy
B. Potential energy
C. Mechanical energy
D. Heat energy
