(i) The wool-yielding animals bear hairs on their body because the thick coat of hair traps a lot of air. Air is a poor conductor of heat so, hairs keep these animals warm.
(ii) 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. It also has a high boiling point which makes it very suitable to measure higher temperatures.
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Answer:
ii) mercury has high melting and boiling point
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(i) The wool-yielding animals bear hairs on their body because the thick coat of hair traps a lot of air. Air is a poor conductor of heat so, hairs keep these animals warm.
(ii) 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. It also has a high boiling point which makes it very suitable to measure higher temperatures.