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| 1. What are the three modes of heat transfer? |  |
Ans. The three modes of heat transfer are conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between particles, convection is the transfer of heat through the movement of fluid, and radiation is the transfer of heat through electromagnetic waves.
| 2. How does conduction work in terms of heat transfer? | |
Ans. Conduction occurs when heat is transferred through direct contact between particles. It happens mainly in solids, where the particles are closely packed. When a hot object comes into contact with a colder object, the hotter particles transfer their energy to the colder particles through collisions, causing the colder object to heat up.
| 3. What is convection and how does it contribute to heat transfer? | |
Ans. Convection is the mode of heat transfer that occurs through the movement of fluids (liquids or gases). It happens due to the differences in density within the fluid. When a fluid is heated, it becomes less dense and rises, while the cooler, denser fluid sinks. This movement of the fluid transfers heat from one place to another, contributing to heat transfer.
| 4. How does radiation play a role in heat transfer? | |
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 as well. All objects emit and absorb electromagnetic waves, and the rate of radiation depends on the temperature and surface characteristics of the objects. This mode of heat transfer is responsible for the transfer of heat from the Sun to the Earth.
| 5. What are some practical applications of heat transfer? | |
Ans. Heat transfer has numerous practical applications in our daily lives. It is essential for cooking, heating, and cooling systems. It is used in refrigerators, air conditioners, and heaters to transfer heat from one place to another. Heat transfer is also crucial in industries like power generation, manufacturing processes, and transportation systems. Understanding the laws of heat transfer enables us to design efficient systems and ensure the comfort and safety of our everyday lives.
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