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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

Laboratory Principles: Dress, Safety Glass, Mask and Hand Gloves

Laboratory is a very important place, where research is carried out for human welfare. Chemical laboratory is unique place to know and develop something new. Different types of chemicals are generally used in the laboratory. Among these, some are volatile, hazardous and very harmful to human health. The consequences could be severe if someone does not have any idea of the laboratory guidelines. It is very important to remember that proper knowledge of the guidelines for using laboratory can ensure self-safety and safety of classmates as well. Some important guidelines regarding the use of laboratory are given below:
  • Dresses to be used in the laboratory
  • Use of safety glass in the laboratory
  • Use of mask in the laboratory
  • Use of hand gloves in the laboratory

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