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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

Background of Periodic Table


  • In 1789, Antoine Lavoisier first divided the elements metals and non-metals
  • In 1829, the scientist Dobereiner found Law of Triads.
  • In 1864, John A R Newlands gave a theory called Law of Octet
  • In 1869, Mendeleev proposed a periodic table based on atomic mass
  • In 1913, Atomic number was discovered by Mosley.

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