What is the primary purpose of using rigid tubing with a manometer?

The primary purpose of using rigid tubing with a manometer is to provide accurate vacuum pressure readings. Rigid tubing maintains a consistent diameter and shape, which helps eliminate variations in pressure that might occur with flexible tubing. This accuracy is crucial in clinical settings where precise measurements of vacuum pressure are necessary for the proper functioning of medical devices. Ensuring that the manometer reflects the true pressure in a system directly affects diagnostics and therapeutic outcomes, making the choice of rigid tubing essential for reliability in measurements.