Water is being heated in a vertical piston-cylinder device. The piston has a mass of51 kg and a cross-sectional area of 100 cm2. If the local atmospheric pressure is 100kPa, determine the temperature at which the water starts boiling

The temperature at which the water starts boiling is 111.35 °C.

Explanation:

First, we have to determine the total pressure experimented by water inside the piston-cylinder device. The total pressure is the sum of atmospheric and gauge pressures, the gauge pressure is the weight of piston divided by its cross-sectional area, that is:

Where:

- Gauge pressure, measured in pascals.

- Mass of the piston, measured in kilograms.

- Gravitational constant, measured in meters per square second.

- Cross-sectional area, measured in square meters.

The total pressure of water is:

Temperature at which water starts boiling is the saturation temperature associated with total pressure, which can be obtained from property tables:

The temperature at which the water starts boiling is 111.35 °C.

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