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A barometer made of very narrow tuve (se...

A barometer made of very narrow tuve (see fig) is placed at normal temperature and pressure. The coefficient of volume expansion of mercury is `0.00018per C^@` and that of the tube is negligible. The temperature of mercury in the barometer is now raised by `1^@C`, but the temperature of the atmosphere does not raised by `1^@C`, but the temperature of the atmosphere does not change. Then the mercury height in the tube remains unchanged.

Text Solution

Verified by Experts

False, Pressure `P_(1)=P_(2)=1 atm =hrhog`. On changing the temperature `g` will not change and atmosphere pressure wil not change
`:.hxxrho=constt.`
When temperature is increased the density of `Hg` decreases and hence `h` increases.
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Knowledge Check

  • State true/false: S_1 : Hydrostatic pressure is a scalar quantity even though pressure is force divided by area and force is a vector quantity? S_2 : A barometer made of a very narrow tube (see figure) is placed at normal temperature and pressure. The coefficient of volume expansion of mercury is 0.00018//.^@C and that of the tube is negligible. The temperature of mercury in the barometer is now raised by 1^@C but the temperature of the atmosphere does not change. Then, the mercury height in the tube remains unchanged. S_3 A block of ice with a lead shot embedded in it is floating on water contained in a vessel. The temperature of the system is maintained at 0^@C as the ice melts. When the ice melts completely the level of water in the vessel rises.

    A
    TTF
    B
    TFT
    C
    TFF
    D
    TTT
  • The height of mercury column of a barometer at the sea level is

    A
    76 m
    B
    76 cm
    C
    1 m
    D
    `0.76 ` mm
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