Chapter 12.1, Problem 10SSC

Interpretation Introduction

Interpretation:

The method of measurement of gas pressure needs to be explained.

Concept introduction:

Gas is one of the physical state of matter in which the particles are located away from each other.

The particles of gas have high kinetic energy and exhibit different characteristics compare to liquid and solids.

Answer to Problem 10SSC

Barometer and manometer are used to measure the gas pressure.

Explanation of Solution

Due to high kinetic energy and elastic collisions of gas particles with the container wall, they exert certain pressure on the wall of container. This is called as gas pressure. The gas pressure can measure with the help of various devices such as manometer or barometer.

Barometers is an instrument used to measureatmospheric pressure. It measures the gas pressure with the help of height ofthe mercury in a barometer, which is always about 760 mm. The height of the mercury is due to Gravity and the gas pressure.

Manometers are also used to measuregas pressure in a closed container. It is a flask connected to a U-tube, filled with mercury.

In the open valve between the flask and the U-tubediffuses gas particles out of the flask into the U-tube and push down on the mercury in thetube. The difference in the height of the mercury in the twoarms is used to determine the gas pressure in the flask.

Conclusion

Barometer and manometer are used to measure the gas pressure.