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Conduction Convection Radiation - Heat Video Lecture - Class 7

FAQs on Conduction Convection Radiation - Heat Video Lecture - Class 7

1. What is conduction in terms of heat?

Ans. Conduction is the transfer of heat through direct contact between two objects or substances. In this process, heat energy is transferred from a hotter object to a colder object by the collision of molecules.

2. How does convection transfer heat?

Ans. Convection is the process of heat transfer through the movement of fluids, such as water or air. When a fluid is heated, it becomes less dense and rises, while the cooler, denser fluid sinks. This creates a circular motion that transfers heat from one area to another.

3. What is radiation in relation to heat?

Ans. Radiation is the transfer of heat through electromagnetic waves. Unlike conduction and convection, radiation does not require a medium to transfer heat. It can occur in a vacuum and is responsible for the heat we receive from the Sun.

4. How does conduction, convection, and radiation differ from each other?

Ans. Conduction involves the transfer of heat through direct contact, convection occurs through the movement of fluids, and radiation transfers heat through electromagnetic waves. Conduction and convection require a medium, while radiation can occur in a vacuum.

5. What are some examples of conduction, convection, and radiation in our daily lives?

Ans. Some examples of conduction include touching a hot stove or holding a warm cup of coffee. Convection can be observed when boiling water or feeling a breeze on a hot day. Radiation is evident when feeling the warmth of the Sun or using a microwave to heat food.

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Sep 19, 2025 Last updated

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