The residual volume can not be measured directly.
<h3>How is residual volume measured?</h3>
Residual volume is known to be measured by what we call a gas dilution test.
Note that this test often measures how the concentration of the gases in the container changes.
<h3>What is residual volume?</h3>
This is known to be the Volume of air that is left over after a FORCED EXPIRATION. Note that it is one that cannot be measured by a spirometer.
Hence, The residual volume can not be measured directly.
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From the data I gathered I would conclude that C is the correct answer.
Answer:
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