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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

Characteristics of Periodic Table


  • There are a total of 118 elements, 7 periods and 18 groups arranged in the periodic table.
  • Group-1 elements are Alkali metals, Group-2 elements are Alkaline earth metals, Group-11 elements are coin metals, Group-16 elements are called Chalcogen, Group-17 elements are Halogen and elements belonging to group-18 are called inert gas.
  • 15 elements with atomic numbers 57-71 are called the Lanthanide elements. Fifteen elements with atomic numbers 89-103 are categorized as Actinide elements

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