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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

What are the function of blood?

Functions of blood

  • The digested food absorbed by the wall of the intestine is transported to the cells by the blood.
  • The excretory materials produced within the cells are carried to the excretory organs by the blood.
  • Hemoglobin of erythrocytes of blood accepts oxygen from the lung and carry it to the cells as oxy-hemoglobin. It also carries the carbon dioxide produced in cellular respiration to the lung from where it goes out of the body.
  • The hormones secreted by different endocrine glands are carried to different parts of the body by the blood.
  • The white blood cells engulf the parasite entering the body by the process of phagocytosis. It also produces antigens that act as the preventives against diseases and thus increase body resistance. Body temperature is also regulated by the blood.
  • The thrombocytes present in the blood, when coming in contact with free oxygen, helps blood coagulation. Thus the thrombocytes stop bleeding from the wounds. 
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