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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 Adulterant food is the barrer of sound health?

Adulterants are harmful chemical substances added to the food for color, taste, smell, and preservation purposes. Commercial colors, antibiotics, chemicals (carbide, formalin, heavy metal) are used vigorously in the foods of Bangladesh. These adulterant foods are injurious to health. The colors used in foods are not food grade at all, these destroy liver function and cause various diseases. Livestock and poultry feeds are also poisoned by these adulterants. So, these are definitely a barrier to sound health. 

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