Home
Class 11
PHYSICS
A glass contains some water at room temp...

A glass contains some water at room temperature `20^(@)C`.Refrigerated water is added to it slowly. When the tempareture of the glass reaches `10^(@)C,`small droplets condense on the outer surface. Calculate the relative humidity in the room. The boling point of water at a jprjjessure of 17.5mm of mercury is `20^(@)C`and at 8.9mm of mercury is `10^(@)C`.

Text Solution

Verified by Experts

Given :
SVF at the dew point = 8.9 mm
SVP at room temperature = 17.5 mm
Dew point = `10^@C` as at this temperature
the condensation starts
Room temperature = ` 20^@C`
` (R_H) = SVP at dew point / SVP at room temp. `
` = 8.9 / 17.5 = 51 %` .
Promotional Banner

Similar Questions

Explore conceptually related problems

Ice at -20^(@)C mixed with 200g water at 25^(@)C . If temperature of mixture is 10^(@)C then mass of ice is -

A carbot freezer takes heat from water at 0^(@)C inside it and rejects it to the room at a temperature of 27^(@)C . The latent heat of ice is 336xx10^(3)Jkg^(-1) . If 5kg of water at 0^(@)C is converted into ice at 0^(@)C by the freezer, then the energy consumed by the freezer is close to :

When a calorimeter contains 40g of water at 50^(@)C , then the temperature falls to 45^(@)C in 10 minutes. The same calorimeter contains 100g of water at 50^(@)C , it takes 20 minutes for the temperature to become 45^(@)C . Find the water equivalent of the calorimeter.

A solution containing 30g of a nonvolatile solute in exactly 90g water has a vapour pressure of 21.85 mm Hg at 25^(@)C . Further 18g of water is then added to the solution. The resulting solution has vapour pressure of 22.18 mm Hg at 25^(@)C . calculate (a) molar mass of the solute, and (b) vapour pressure of water at 25^(@)C .

Water contained in a jar at room temperature (20^(@)C) is intended to be cooled by method - I or method II given below: Method - I : By placing ice cubes and allowing it ito float. Method- II : By wrapping ice cubes in a wire mesh and allowing it to sink. Choose best method(s) to cool the water.

Mercury has an angle of contact equal to 140^(@) with soda lime glass . A narrow tube of radius 1.00 mm made of this glass is dipped in a trough containing mercury .By what amount does the mercury dip down in the tube relative to the liquid surface outside ? Surface tension of mercury at the temperature of the experiment is 0.465Nm^(-1) . Density of mercury =13.6xx10^(3)kgm^(-3)

In an 20 m deep lake, the bottom is at a constant temperature of 4^(@)C . The air temperature is constant at -10 ^(@)C . The thermal conductivity of ice in 4 times that water. Neglecting the expansion of water on freezing, the maximum thickness of ice will be

A double pan window used for insulating a room thermally from outside consists of two glass sheets each of area 1 m^(2) and thickness 0.01m separated by 0.05 m thick stagnant air space. In the steady state, the room-glass interface and the glass-outdoor interface are at constant temperatures of 27^(@)C and 0^(@)C respectively. The thermal conductivity of glass is 0.8 Wm^(-1)K^(-1) and of air 0.08 Wm^(-1)K^(-1) . Answer the following questions. (a) Calculate the temperature of the inner glass-air interface. (b) Calculate the temperature of the outer glass-air interface. (c) Calculate the rate of flow of heat through the window pane.

An unknown metal of mass 192 g heated to a temperature of 100" "^(@)C was immersed into a brass calorimeter of mass 128 g containing 240 g of water at a temperature of 8.4" "^(@)C . Calculate the specific heat of the unknown metal if water temperature stabilizes at 21.5" "^(@)C . (Specific heat of brass is "394" J Kg"^(-1)K^(-1) )