Q1.What do you understand by the term thermal insulation? Give examples to show how insulation plays an important role in the construction of buildings, refrigeration and in industries. Q2. What does the law of conservation of energy state? Why is conservation of energy necessary? Q3.Why do we feel warm on wearing woollen clothes?
Answers
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1 ⏩Thermal insulation refers to the inhibition of thermal energy transfer from one place to another on a piece of material. Thus, if a material has thermal insulation properties, it will be able to slow the transfer of large amounts of heat.
2 ⏩The law of conservation of energy is one of the basic laws of physics and therefore governs the microscopic motion of individual atoms in a chemical reaction. The law of conservation energy states: In a closed system, i.e., a system that isolated from its surroundings, the total energy of the system is conserved.
Law of conservarting digram in pic
3⏩ When we are in a cold temperature, the air around us could take your heat away, and some materials can hold the heat, because of their low thermal conductivity, woolen clothes have a very low one. That's because woolens don't let the heat from your body to escape. They trap the body heat, thus making you feel warm.
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