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It can be. If you had a glass cylinder 35 feet tall, sealed at the top and filled with water, with the base of the cylinder in an open pool of water, the vacuum at the top of the cylinder combined with the normal air pressure at the bottom could support the water up to 32 feet high, or 384 inches high. "Normal" air pressure is about 14.7 PSI (Pounds per Square Inch) , so you could use "inches of water" to measure small changes in pressure instead of measuring in PSI.

But in all my physics classes, I don't think I've ever seen anything measured that way.

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Q: Is inches of water column used to measure gas pressure instead of psig?
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What is the pressure of 10 inches of water column?

10 inches of water column equals to how much gas pressure?


Why pressure is measure in mmHg?

All science uses the metric system for measurements. Meters instead of feet, centimeters instead of inches. A person has to learn the "language" of science.


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