Estimate the mass… 200 mm diameter vertical solved problem



Estimate the mass of a piston that can be supported by a gas entrapped under the piston in a 200 mm diameter vertical cylinder when a manometer indicates a difference of 117 mm of Hg column for the gas pressure.




Estimate the mass of a piston that can be supported by a gas entrapped under the piston in a 200 mm diameter vertical cylinder when a manometer indicates a difference of 117 mm of Hg column for the gas pressure.

200 mm diameter vertical
200 mm diameter vertical




1. A U-tube mercury manometer with one arm open to atmosphere is used to measure pressure in a steam pipe. The level of mercury in open arm is 97.5 mm greater than that in the arm connected to the pipe condenses in the manometer arm connected to the pipe. The height of this column is 34 mm. The atmospheric pressure is 760 mm of Hg. Find the absolute pressure of steam.

2. A U-tube manometer is connected to a gas pipe. The level of the liquid in the manometer arm open to the atmosphere is 170 mm lower than the level of the liquid in the arm connected to the gas pipe. The liquid in the manometer has specific gravity of 0.8. Find the absolute pressure of the gas if the manometer reads 760 mm of Hg.

3. Estimate the mass of a piston that can be supported by a gas entrapped under the piston in a 200 mm diameter vertical cylinder when a manometer indicates a difference of 117 mm of Hg column for the gas pressure.

4. An artificial satellite revolves round the earth with a relative velocity of 800 m/s. If acceleration due to gravity id 9 m/s2 and gravitational force is 3600 N, calculate its kinetic energy.

5. The specific heat capacity of the system during a certain process is given by

cn = (0.4 + 0.004 T ) kJ/kg °C

If the mass of the gas is 6 kg and its temperature changes from 25°C to 125°C find:

(i) Heat transferred;

(ii) Mean specific heat of the gas.

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