Question

Q. Why do we use woolen clothes and blanket during winter days?
Q. What is vacuum flask?
Q. Write down the construction and working of vacuum flask
Q. Write three everyday application of radiation of heat.
Q. How conduction, convection and radiation are alike and how they are different?​

Answer 1

ANSWER

1.Woolen clothes contains a large amount of trapped air. Since air is a bad conductor of heat it does not allow the body heat to flow out, as a result of which, we feel warm and comfortable.

2.a container like a bottle with double walls with an empty space (vacuum) between them, used for keeping liquids hot or cold

3.A vacuum flask is an insulating storage vessel that greatly lengthens the time over which its ... flask by tempering prior to use is advised to maintain and optimize the functioning of the unit

4.The transmission of electromagnetic waves through the microwave oven. The heat emitted by a radiator. Solar ultraviolet radiation, precisely the process that determines the Earth's temperature. The light emitted by an incandescent lamp.

5.Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.

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Answer 2

Answer:

1- Woolen clothes contains a large amount of trapped air. Since air is a bad conductor of heat it does not allow the body heat to flow out, as a result of which, we feel warm and comfortable.

2- A vacuum flask is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings. Invented by Sir James Dewar in 1892, the vacuum flask consists of two flasks, placed one within the other and joined at the neck.

3- A thermos flask has double walls, which are evacuated and the vacuum bottle is silvered on the inside. The vacuum between the two walls prevents heat being transferred from the inside to the outside by conduction and convection.

4- Examples of Everyday Radiation

Examples of Everyday RadiationVisible light.

Examples of Everyday RadiationVisible light.Infrared light.

Examples of Everyday RadiationVisible light.Infrared light.Near ultraviolet light.

Examples of Everyday RadiationVisible light.Infrared light.Near ultraviolet light.Microwaves.

Examples of Everyday RadiationVisible light.Infrared light.Near ultraviolet light.Microwaves.Low frequency waves.

Examples of Everyday RadiationVisible light.Infrared light.Near ultraviolet light.Microwaves.Low frequency waves.Radio waves.

Examples of Everyday RadiationVisible light.Infrared light.Near ultraviolet light.Microwaves.Low frequency waves.Radio waves.Waves produced by mobile phones.

Examples of Everyday RadiationVisible light.Infrared light.Near ultraviolet light.Microwaves.Low frequency waves.Radio waves.Waves produced by mobile phones.A campfire's heat.

5- Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission.

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