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Q1. name for insulators? Q2.It is …

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Q1. name for insulators?

Q2.It is observed that two thin wollen blankets are warmer than a thick wollen blankets?

Q3.Why maecury is used as an indicators in thermometer

Posted by Triya Parmar 8 years, 3 months ago

CBSE > Class 07 > Science

1 answers

Payal Singh 8 years, 3 months ago

Examples of insulators include plastics, Styrofoam, paper, rubber, glass and dry air.
Two thin blankets usually warmer than one thick blanket because air is trapped between them and the air is bad conductor of heat. It does not pass heat from our body to the surroundings.
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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