<prompt> The volumecapacity that can be measured by Hutchisons spirometer is:Residual volumeExpiratory reserve volumeFunctional residual capacityTotal lung capacity  <response>: The volume that remains in the lung even after maximum forceful expiration is residual volume RV. Since it does not come out into the spirometer, it can not be measured by the conventional spirometry performed on Hutchisons spirometer. Any capacity that includes RV therefore can not be detected by spirometry. Thus, FRC ERV RV and TLC TV IRV ERV RV can not measured directly by spirometry. Hence, the answer is ERV, which can be measured directly by spirometry. 