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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 is revolution?

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What is revolution? Revolution has been central to the formation of the modern world. The word itself refers to radical, transformative change and has many generic uses describing phenomena from the "industrial revolution" to the "sexual revolution". As a historical process, "revolution" refers to a movement, often violent, to overthrow an old regime and effect complete change in the fundamental institutions of society.  After the French Revolution of the 18th century which deposed the monarchy and attempted to refashion society from top to bottom, revolution became synonymous with the radical overcoming of the past. Modernity, many came to believe, could only be achieved through such violent and total transformation. The inspiration for many 20th century revolutions was the Russian Revolution of 1917 led by Vladimir Lenin and inspired by the ideas of Marxist Communism. Marx believed that revolution was necessary to move societies from one historical s

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