1.1. Principle of Working of Barometers

Try these first

1. 1.

   What units are used to measure atmospheric pressure in a barometer?

   Hint

   Think about the liquid used in barometers.

2. 2.

   What is gauge pressure?

   Hint

   Consider what ‘gauge’ means in pressure context.

3. 3.

   What is the main function of a barometer?

   • To measure temperature
   • To measure atmospheric pressure
   • To measure velocity

   Hint

   Think about what barometers are used for in meteorology.

4. 4.

   True or False: Gauge pressure includes atmospheric pressure in its measurement.

   • True
   • False

   Hint

   Remember the distinction between absolute pressure and gauge pressure.

5. 5.

   A barometer shows a height of 765 mm of mercury. Calculate the atmospheric pressure in Pascals.

   Hint

   Use the conversion factor for mmHg.

6. 6.

   If a manometer shows a height difference of 30 cm between two fluid levels, determine the pressure difference in Pascals, assuming the fluid density is 1000 kg/m³.

   Hint

   Consider pressure defined as weight per unit area.