What device is used to measure the flow of medical gases?

The flowmeter is the appropriate device used to measure the flow of medical gases. It provides accurate readings of the rate at which gas is delivered from a system, which is crucial for ensuring that patients receive the correct dosage of medical gases, such as oxygen or nitrous oxide, during treatment.

In the context of medical applications, flowmeters are specifically designed to allow healthcare professionals to monitor and adjust the flow rate of gases according to the patient's needs. Various types of flowmeters exist, including variable orifice and rotameter designs, each with features suited for different clinical scenarios.

Other devices mentioned play different roles: a manometer measures pressure, which is important but not directly related to flow; a barometer is used primarily for measuring atmospheric pressure, not gas flow; and a chronometer is a timekeeping device rather than one for measuring gas flow. Thus, the flowmeter stands out as the essential tool for this specific application in medical settings.