How do gas meters measure how much gas you use if gas can be compressed? (unlike water)
In: Engineering
1) Gas is supplied at a particular pressure, and how much the gas is compressed at that pressure is fairly easy to calculate. Thus, if you know exactly how much the gas is being compressed, you know how much gas is flowing.
2) Gas is actually easy to meter and control if you have a pressure change on either side of your meter; as the gas expands from one pressure to another (say, 500 psi to 50 psi), it’ll also have a temperature change. The precise amount of the temperature change corresponds *directly* to how much gas is actually flowing; all you need to know is what mixture of species are actually in the gas. Thus, if you know what the gas is made of, and you can measure the temperature and pressure of the gas on either side of a regulator, you know precisely how much gas is flowing.
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