ERV = Expiratory Reserve Volume
ERV stands for Expiratory Reserve Volume
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Let's say you've just exhaled a normal breath (you've exhaled your normal
Tidal Volume). Now, your ERV is the amount of air you can still exhale
until you just can't exhale no more.
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As illustrated in the figure below, it represents the amount of air
you are still able to exhale after you have already expired a normal
breath.
Refer to this cool picture:
