Flow measurement of liquids has been around much longer than the measurement of gas. Even so, you would think that it would have evolved at a much faster pace than it's counterpart. My guess is that it was much more of a challenge and required more effort to meter gas in the beginning. Liquids seem to have a more finite physical presence. I can always pour liquid into1 gallon containers & then count the containers. We are not so lucky with gas! But due to the complexity of some types of liquids and their chemical composition, metering them can pose to be an extreme challenge. Thus the need for improved metering devices, techniques and technology. Flow computers are designed for these types of tasks.
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