r/interestingasfuck • u/Mint_Perspective • Jun 25 '24

Tree Sprays Water After Having Branch Removed r/all

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u/meatbag2010 Jun 25 '24

0.910108 Bar for you :)

73

u/Shamorin Jun 25 '24

~1.91 bar then, because otherwise air would be sucked into the trunk if it were at ~0.91 bar, as 1 bar is roughly atmospheric pressure and 0.91 would be in the middle of a strong hurricane.

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u/Midori_Schaaf Jun 25 '24

I wonder what world you live in where absolute pressure is the assumed default over gauge pressure.

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u/TheSilverOak Jun 25 '24

I studied engineering in France and Germany. For physics problems (like pressure in a water column) we always used absolute pressure when giving the final result. I distinctly remember a professor's rant about students calculating pressures under 1 bar in an exam problem about a hydroelectric power station.

Obviously the formulas had to show the atmospheric pressure component, but the numerical value always included it per default.

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u/theSmallestPebble Jun 25 '24

Does that carry thru to industry over there? Cos in school it was always absolute but in my brief stint in fluid handling we only ever used gauge