What is the term for the device that regulates the pressure of gas from the tank to the appliance?

The device that regulates the pressure of gas from the tank to the appliance is called a regulator. Regulators are essential components in gas systems as they ensure that the gas is delivered at a safe and appropriate pressure for the appliances to function effectively. They reduce the high pressure from the storage tank to a lower, usable pressure that is suitable for the specific appliance being used.

A compressor, on the other hand, is used to increase the pressure of a gas rather than regulate it, which makes it unsuitable for this purpose. A meter measures the flow of gas, but it does not control or regulate the pressure. A gauge provides a visual indication of the pressure level but does not influence or adjust it. Hence, among the choices provided, the regulator is the correct term for the device that performs the function of pressure regulation in gas delivery systems.