The inside temperature of a wall in a dwelling is 15°c. if the air in the room is at 21°c, what is the maximum relative humidity, in percent, the air can have before condensation occurs on the wall?

Given:

Wall's inside temperature,

Room air temperature,  

Solution:

To calculate percentage max relative humidity, we make use of steam table for saturated pressure of wall and air:

From steam table:

At :

At  :

Now,

(RH)_{max} = 68.58%

Therefore, max Relative Humidity of the air before the occurrence of condensation in wall is 68.85%

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answer: report them

explanation: