Standard atmospheric pressure at sea level is often expressed as 76 cm of mercury. This means that:

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Question

Standard atmospheric pressure at sea level is often expressed as 76 cm of mercury. This means that:

Accepted Answer

Atmospheric pressure can support a column of mercury 76 cm high — Award 1 mark for correct answer. At sea level, atmospheric pressure equals the pressure exerted by a 76 cm column of mercury, which is approximately 101 000 Pa. A is incorrect because it confuses pressure with mass. C is incorrect because the atmosphere extends many kilometers high. D is incorrect because this is not a measure of air density.

Answer

The atmosphere weighs 76 kg

Answer

The density of air is 76 kg/m³

Answer

Atmospheric pressure can support a column of mercury 76 cm high

Answer

The atmosphere extends 76 cm above sea level

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