Bonus: How is pressure measured? (and other questions)
Chemistry For Your Life
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The Importance of Atmospheric Pressure
Inches of mercury. This is the typical unit of weathermen reporting atmospheric pressure. One bar was defined as a hundred thousand kilopascals. In inches of H2O used in some industrial places like compressors and pipelines. A private pilot friend also said they use mercury inches in flight plans. PSI became the standard English unit of pounds.
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