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

Explanation

To solve the problem, we need to determine the length of the barometer tube above the mercury level in the reservoir. We will use the information provided about the readings of the faulty barometer and the atmospheric pressures.

### Step-by-Step Solution:

1. **Understanding the Problem**:
- We have a faulty barometer that reads different heights of mercury (74.0 cm and 72.1 cm) at different atmospheric pressures (76.0 cm and 74.0 cm of mercury).
- The saturation vapor pressure at the air temperature is given as 1.0 cm of mercury.

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