A student uses a Bourdon gauge to measure the pressure of a gas trapped in a container. The gauge reads 180 kPa.

Which statement about this measurement is correct?

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Question

A student uses a Bourdon gauge to measure the pressure of a gas trapped in a container. The gauge reads 180 kPa.

Which statement about this measurement is correct?

Accepted Answer

The gas pressure is 180 kPa above atmospheric pressure — Award 1 mark for understanding that a Bourdon gauge measures gauge pressure, which is the difference between the gas pressure and atmospheric pressure. A is incorrect — absolute pressure would be gauge pressure plus atmospheric pressure. C is incorrect — the reading indicates gas pressure, not atmospheric pressure. D is incorrect — the Bourdon gauge shows pressure above atmospheric, not below.

Answer

The gas pressure is 180 kPa below atmospheric pressure

Answer

The absolute pressure of the gas is 180 kPa

Answer

The gas pressure is 180 kPa above atmospheric pressure

Answer

Atmospheric pressure at that location is 180 kPa

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