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by holgerschurig
5 days ago
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> This push on every wall is pressure, and we will measure it in atmospheres, multiples of the ordinary pressure of the air around us. No, don't do that. Because the pressure of the atmosphere isn't constant. It varies with weather and how high you are. Instead use Pascal (Pa) or Hectopascal (hPA). I really pays back to use SI units for physical things. Suddenly you have formulas without weird constants, like 1 Pa = 1 N/m^2 It's a sad thing that new articles still propose units that are (since many, many years) outdated: the metric system is from 1793, the SI is from 1960. BACK then people didn't knew better and used the varying atmosphere as base. But today ?!?!? |
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1 atm = 101,325 PA
It is not an SI unit but it is widely used and very useful in situations, such as this, where pressure relative to atmospheric pressure is relevant.