Final answer:
Measurement devices like heated-wire pneumotachometers and pressure differential pneumotachometers are affected by the composition of the gas due to variations in heat transfer and viscosity-dictated flow. Contrastingly, dry rolling-seal spirometers are less impacted, measuring volume more so than gas properties.
Step-by-step explanation:
The devices used to measure gas flow or pressure can indeed be affected by the composition of the gas being measured. For example, heated-wire pneumotachometers work on the principle of heat transfer, and different gases conduct heat at different rates, which can affect the readings. Similarly, pressure differential pneumotachometers, which measure gas flow based on the pressure difference across a resistance, can be affected because the physical properties of the gas, such as density and viscosity, influence flow and, consequently, pressure readings.
On the other hand, some devices, like the dry rolling-seal spirometer, are designed to measure volume and are less affected by gas composition. The Pitot tube-type flow sensor measures flow velocity and can also be affected by the density and viscosity of the gas, which are related to its composition.