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L10 : Conduction - Heat, Science, Class 7 Video Lecture

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FAQs on L10 : Conduction - Heat, Science, Class 7 Video Lecture

1. What is conduction?
Ans. Conduction is the process of heat transfer through direct contact between objects or substances that are in physical contact with each other. It occurs when heat energy is transferred from a region of higher temperature to a region of lower temperature.
2. How does conduction work?
Ans. Conduction works by transferring heat energy from one molecule to another through direct contact. When objects or substances are in contact, the molecules with higher kinetic energy (higher temperature) transfer some of their energy to the molecules with lower kinetic energy (lower temperature). This transfer of energy continues until thermal equilibrium is reached.
3. What are examples of conduction in everyday life?
Ans. There are several examples of conduction in everyday life. Some common examples include: - Touching a hot pan and feeling the heat transfer to your hand. - Placing a cold spoon in a hot cup of coffee and feeling the spoon warm up. - Walking barefoot on a hot pavement and feeling the heat transfer to your feet. - Holding an ice cube and feeling it melt as heat is conducted from your hand to the ice.
4. How does conduction differ from convection and radiation?
Ans. Conduction, convection, and radiation are the three modes of heat transfer. While conduction involves heat transfer through direct contact, convection occurs when heat is transferred through the movement of fluids (liquids or gases), and radiation is the transfer of heat through electromagnetic waves. Unlike conduction, convection and radiation do not require physical contact between objects or substances.
5. What factors affect the rate of conduction?
Ans. The rate of conduction is influenced by several factors. Some key factors include: - Temperature difference: The greater the temperature difference between two objects, the faster the rate of conduction. - Surface area: Larger surface areas allow for more efficient heat transfer through conduction. - Type of material: Different materials have different conductivities, with metals being good conductors and insulators being poor conductors. - Thickness: Thinner objects conduct heat faster than thicker objects.
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