I. Short-answer type questions :
1. Why do we use mercury as a fluid in thermometers and not water?
2. Why do we wear woollen clothes in winter?
3. What kind of clothes will keep us comfortable in summer?
4. What are the three modes of transfer of heat?
5. How are trade winds caused?
6. What are good conductors of heat? Give two examples.
Answers
Answer:
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Explanation:
1.Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer.
2.we wear woolen clothes in winter because woolen clothes have fine pores filled with air. Wool and air are both conductors of heat and thus keeps the body warm.
3.During summer, we normally wear light coloured cotton clothes. We sweat a lot in summers. Cotton is a good absorber of water. Thus, it absorbs sweat from our body and exposes the sweat to the atmosphere, making its evaporation faster.
4.Heat is transfered via solid material (conduction), liquids and gases (convection), and electromagnetical waves (radiation).
5.Trade winds are caused by the strong warming and evaporation within the atmosphere around the equator.
6.Generally, all metals are good conductors of heat. Hence, two examples of conductors are copper and gold. Both of them are excellent conductors of heat.
Answer:
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thanks for the answers