Final answer:
A pneumatic microventilation system is required to measure lung volume with a flow-sensing spirometer. It measures airflow and converts it to volume, helping to diagnose lung diseases.
Step-by-step explanation:
To measure volume using a flow-sensing spirometer, the necessary component is a pneumotachometer. A pneumotachometer is a device used in spirometry that measures the speed of air entering and leaving the lungs. As air flows through the pneumotachometer, the device converts the flow rate into a volume, allowing for the assessment of pulmonary function. Spirometers equipped with a pneumotachometer are commonly used for this purpose and can help diagnose different types of lung conditions.