Barometer
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Description
Safety
Adjusting the Reservoir
Adjusting the Scale
Taking a Reading
Correcting for Temperature Effects
Related Modules
Reading a Vernier Scale
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Adjusting the Reservoir

 

Video. Adjusting the reservoir.

Before the atmospheric pressure can be read from the scale, the mercury reservoir must be properly adjusted (See Video 1).

check The mercury level in the reservoir should be adjusted:

  1. so that the tip of the needle is 1 cm below the mercury surface.
  2. so that the tip of the needle just touches the mercury surface.
  3. so that the mercury fills the entire reservoir.
  4. only if it is raining outside.

Answer: B. So that the tip of the needle just touches the mercury surface.