Respuesta :
The density of mercury is greater and the mercury neither wets nor sticks to the glass tube therefore, it gives the correct reading. hence, mercury is used in barometer.
The barometer works by balancing the weight of mercury in the glass tube against the atmospheric pressure. if weight of mercury is less than the atmospheric pressure, the mercury level in the glass tube rises (high pressure). If it's more than atmospheric pressure, the mercury level falls (low pressure). Although, other liquids can be used in barometer, mercury is the common one. The density of mercury allows the vertical column of the barometer to be of manageable size. Using mercury in barometer is advantageous as its density is high it has low vapour pressure; its rate of evaporation is not very high. Mercury barometer is precise and offers a simple method of measuring the atmospheric pressure. Mercury is inexpensive and does not require any expensive equipment to be made.
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