3.1. Barometers and Manometers

Try these first

1. 1.

   What does a barometer measure?

   Hint

   Think about weather instruments.

2. 2.

   What is the density of mercury compared to water?

   Hint

   Consider why we use it in barometers.

3. 3.

   What does a barometer measure?

   • Atmospheric pressure
   • Temperature
   • Density

   Hint

   Consider weather forecasting tools.

4. 4.

   True or False: A differential manometer measures pressure relative to the atmosphere.

   • True
   • False

   Hint

   Think about the terminology.

5. 5.

   A gas is maintained at a fixed volume, at a pressure of 2 atm. If the temperature is raised while keeping the volume constant, what happens to pressure?

   Hint

   Remember the relationships between temperature and pressure in gases.

6. 6.

   Calculate the height of mercury in a barometer that measures an atmospheric pressure of 95000 Pa.

   Hint

   Use the standard density of mercury for conversion.