Question

1. What is temperature?
2. Eskimos make igloo out of straw to stay indoors.Do you know why?
3.What do you mean by convection of heat?
What are the three modes of transfer of heat?
4. What are insulators of heat? Give two examples.
5. Why do we use mercury as a fluid in thermometer and not water?​

Answer 1

the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.

Snow's insulating properties enable the inside of the igloo to remain relatively warm. In some cases, a single block of clear freshwater ice is inserted to allow light into the igloo. Igloos used as winter shelters had beds made of loose snow, skins, and caribou furs.

Heat conduction is the transfer of internal thermal energy by the collisions of microscopic particles and movement of electrons within a body. The microscopic particles in the heat conduction can be molecules, atoms, and electrons. 

There are three modes of heat transfer:

conduction, radiation, and convection.

Any material that keeps energy such as electricity, heat, or cold from easily transferring through is an insulator. Wood, plastic, rubber, and glass are good insulators.

We use mercury in thermometers as they remain in liquid form even with a change of temperature in it.

Water cannot be used as a thermometric liquid, because it is not helpful to measure below 0°C and above 100°C. 

Answer 2

1) Temperature, measure of hotness or coldness expressed in terms of any of several arbitrary scales and indicating the direction in which heat energy will spontaneously flow—i.e., from a hotter body (one at a higher temperature) to a colder body (one at a lower temperature)

2)The Inuit, better known to many as Eskimos, invented the igloo centuries ago. The igloo was a means for hunters to survive brutal winters in a vast area spanning more than 3,500 miles, including eastern Siberia, Greenland, Alaska and parts of Canada. An igloo in the frigid wildernessis illuminated by a fire.

3) Convection: The process of heat transfer from one part of a fluid to another part by the actual movement of the particles of the fluid is calledconvection. Liquid and gases are heated by the process of convection. For example: In winter, the air over the ocean is hot as compared to that on the landmass.

4) Conductors are the materials that are good conductors of thermal energy whereas Insulators poor conductors ofthermal energy. Conductors of heat: copper, iron. Insulators of heat: plastic, rubber.

5)No, we cannot use water in place of mercury in athermometer. Explanation: Mercury is the only metal which is liquid in the room temperature. Ifwater is used you cannot get any proper readings of temperature.

Explanation:

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