A barometer made of a very narrow tube (see Fig. 4.263) in placed at normal temperature and pressure. The coefficient of volume expansion of mercury is $0.00018$ per degree centigrade and that of the tube is negligible. The temperature of mercury in the barometer is now raised by $1^{o} C$ , but the temperature of the atmosphere does not change. Then, the mercury height in the tube remains unchanged.

True

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False

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Solution

The correct option is B False
FALSE; due to rise in temperature, volume increases and hence density decreases i.e. more height will be included to balance the atmospheric pressure, hence, height will increase.

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Similar questions

Q. A barometer made of very narrow tube is placed at normal temperature and pressure. The coefficient of volume expansion of mercury is

0.00018

per

^{o} C

and that of the tube is negligible. The temperature of mercury in the barometer is now raised by

1^{o}

C, but the temperature of the atmosphere does not change. Then the mercury height in the tube remains unchanged.

Q. A barometer is constructed with its tube having radius 1.0 mm. Assume that the surface of mercury in the tube is spherical in shape. If the atmospheric pressure is equal to 76 cm of mercury, what will be the height raised in the barometer tube? The contact angle of mercury with glass = 135° and surface tension of mercury = 0.465 N m⁻¹. Density of mercury = 13600 kg m⁻³.

A barometer correctly reads the atmospheric pressure as 76 cm of mercury. Water droplets are slowly introduced into the barometer tube by a dropper. The height of the mercury column first decreases and then becomes constant. If the saturation vapour pressure at the atmospheric temperature is 0.80 cm of mercury, find the height of the mercury column when it reaches its minimum value.

A faulty barometer contains certain amount of air and saturated water vapour. It reads 74.0 cm when the atmospheric pressure is 76.0 cm of mercury and reads 72.10 cm when the atmospheric pressure is 74.0 cm of mercury. Saturation vapour pressure at the air temperature = 1.0 cm of mercury. Find the length of the barometer tube above the mercury level in the reservoir.

Q. A mercury barometer reads h mm Hg with the temperature of the mercury at T

^{o} C

. The barometer reading corrected for the standard temperature 0

^{o} C

with

β

denoting the volumetric expansion coefficient of mercury in 0

^{o} C

, is

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The correct option is B FalseFALSE; due to rise in temperature, volume increases and hence density decreases i.e. more height will be included to balance the atmospheric pressure, hence, height will increase.

The correct option is B False
FALSE; due to rise in temperature, volume increases and hence density decreases i.e. more height will be included to balance the atmospheric pressure, hence, height will increase.