1.

Why should the bulb be immersed in the liquid for which temperature is to be measured​

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Answer:

Thermometer is a device which is used to measure temperature. Thermometer is made of a long NARROW glass tube; with a bulb at ONE end. ... Mercury is a metal which is in LIQUID STATE at room temperature and it READILY expands or contracts at the slightest change in temperature. Hence, mercury is used in thermometer.

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