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What is thermometry?

Thermometry The branch of heat relating to the measurement of the temperature of a body is called thermometry. The thermometer is an instrument used to measure the temperature of a body. The essential requisites of a thermometer are given as under:  1) Construction, 2) Calibration, and 3) Sensitiveness. For the construction of a thermometer, the proper choice of a substance, whose physical property varies uniformly with rising in temperature, is essential. 1) Construction The physical property of a substance plays an important role in the construction of a thermometer. In a mercury thermometer, the principle of expansion of mercury with rising temperature is used. The platinum resistance thermometer is based on the principle of the change in resistance with a change in temperature. The gas thermometer is based on the principle of change in volume or pressure with a change in temperature. 2) Calibration  When a thermometer is constructed, it should be properly calibrated. The standa

Why chemistry is called the key science?

Why chemistry is called the key science?

Other branches of science are related to chemistry. Chemistry is used in medical science to understand the life, etiology of disease and cure them, etc. Physics works with matters, which are made up with atoms, molecules, etc. Therefore, physics needs chemistry. Semi-conductor, chips, LCD crystals of computer science are chemistry. Hence it is called the key science. 

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