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The mass of water vapour divided by the ...

The mass of water vapour divided by the mass of dry air in a volume of air at a given temperature is called

A

Absolute humidity

B

Specific humidity

C

Relative humidity

D

Humidity during rain

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The correct Answer is:
A
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Knowledge Check

  • The actual moisture content of a sample of air as a percentage of that contained in the same volume of saturated air at the same temperature is called:

    A
    absolute humidity
    B
    relative humidity
    C
    specific humidity
    D
    vapour pressure

  • On a certain day the vapour pressure is 14 mm of Hg for water vapour in air at 20^@C . The saturated vapour pressure is 17.5 mm. How many moles of water vapour per litre of air would be required to saturate air at this temperature ?

    A
    `9.41 xx 10^(-4) `
    B
    `9.14 xx 10^(-4)`
    C
    `1.914 xx 10^(-4) `
    D
    `4.19 xx 10^(-4)`

  • The quantity of water in a particular volume of air is called

    A
    1. Absolute humidity
    B
    2. Specific humidity
    C
    3. Relative humidity
    D
    4. Humidity during rain

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    At 30^(@)C , the actual amount of water vapour present in 1 m^(3) of air is 15 g, whereas 30 g of water vapour is required to saturate air at the same temperature. Find the relative humidity.

    The heat is supplied to a given mass of water. Draw the variation of volume of water with its temperature.

    Relative humidity id defind as the ration of partial pressure of water in air at a given temperature to the vapour pressure of water at that that temperature Calculate the mass of water per litre air at (a) 20^(@)C and 45% relative humidity (b) 0^(@)C and 95% relative humidity (c ) Discuss wether temperature or relative humidity has the greater effect on the mass of water vapour in air Given P_(H_(2)O)^(@) =17.5 torr at 20^(@)C and 4.58 torr 0^(@)C .

    If C=332 m s^(-1) , say the velocity of sound in dry air at STP, find the velocity of sound in loist air at STP. Molecular weight of air =28.8, that of water vapour =18, gamma of dry air =1.4 and gamma of water vapour =1.33 . The standard pressure is 750 mm of mercury and standard temperature is 0^(@)C . the vapour pressure at 0^(@)C is 4.8 mm of mercury.

    The mass of water vapour in air enclosed in a certain space 60g and the mass of water vapour needed to saturate the same air with water vapour under the same condition is 100g.What is the corresponding % relative humidity ?

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