The temperature and the relative humidity of air are `20^(@)c and 80%` on a certain day. Find the fraction of the mass of water vapour that will condense if the temperature falls to `5^(@)C .The saturation vapour pressure are 17.5mm`and 6.5mm of mercury at `20^(@)c and 5 degree C respectively.

Explanation

To solve the problem of finding the fraction of the mass of water vapor that will condense when the temperature falls from \(20^\circ C\) to \(5^\circ C\), we can follow these steps:

### Step-by-Step Solution:

1. **Identify Given Data:**
- Initial Temperature, \(T_1 = 20^\circ C\)
- Final Temperature, \(T_2 = 5^\circ C\)
- Relative Humidity at \(T_1 = 80\%\)
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