• Etterra@discuss.online
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    4 days ago

    These stupid sensors don’t do anything useful, they’re just a needlessly excessive expense when they need to be replaced.

  • passiveaggressivesonar@lemmy.world
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    4 days ago

    I know this is obvious but it boggles my mind how each square inch of that tire has almost 100lbs of force pushing on it

    Just realizing now why hydraulics are so strong, a 6 inch squared piston at 100 psi is 600 pounds of force

  • Lowpast@lemmy.world
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    5 days ago

    Why the fuck is the word shit “censored”. What is the point of obfuscating a few pixels yet the word is still visible

    • MisterFrog@lemmy.world
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      4 days ago

      As much as hPa is legitimate, in English speaking contexts I wish we kept to 10^3 prefixes. (Pa, kPa, MPa, GPa etc).

      Like how we keep to nm, μm, mm, m, km. Mostly.

      Or if one really must, atmospheres. Other units are just more of a pain to convert between, like yeah, it’s metric, so it’s not THAT hard, but just nicer in my opinion if it’s consistent intervals.

      Alas, at least I very rarely need to deal with PSI. Only with valve manufacturers using imperial valve coefficients (Cv values), grumble, grumble. They don’t even include the units usually, which to me is heresy. The units are US gallons/min of water at 60 °F per pressure drop of 1 PSI. Like, US engineers have this really stupid habit of not including units in constants and coefficients in some contexts, drives me up the wall.

      Thanks for being the convenient recipient of this metric engineer’s unit rant.

      • Thorry84@feddit.nl
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        4 days ago

        As far as I know hPa is the preferred unit for air pressure and is used a lot. Usually referring to the air pressure of the atmosphere.

        Also hectometer is used a lot when talking about land measurements. And we don’t mostly keep to mm and m, in my experience cm is the most used and most useful measurement for every day objects.

        All of the different prefixes are valid and are used. It just depends on what context, which one is the most useful. No reason to stick to the 10^3 units, just use them all.

        • MisterFrog@lemmy.world
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          3 days ago

          I should clarify, this is my personal preference, for ease of conversion. I wish we stuck to consistent intervals. They’re all valid, just that I find it very lovely that in industrial/construction we don’t use cm (in Australia)

          But there are so many various pressure units in use, which is a slight inconvenience. Pa, Bar, atm, cm-water, are the ones I’ve come across in actual use so far. (Metric engineering context, RIP US engineers)

          Makes it necessary for me to use a calculator to make sure I’m not messing something up. kPa to mbar: okay *bar/(100 kPa) * 1000 mbar/bar (which I’m now noticing is hPa)

          So in addition to my preference for consistent prefix intervals, let’s also stop using Bar, cm-water, and anything else that’s not Pa. That’d be nice ☺️

    • 9point6@lemmy.world
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      5 days ago

      I find bar more intuitive even if it’s just hPa/1000

      Nearly 7 bar is impressive for any tyres

      • MentalEdge@sopuli.xyz
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        4 days ago

        Any car tire.

        For road bicycles 7 bar is just “normal”, 8 and above isn’t unheard of.

        A guy once asked if I was crazy when I was pressurizing my hybrid bike to 6 bar, and I just pointed to the sidewall where the rating said 4.5-6.5 bar. The range is wide because the pressure you should use varies depending on what you weigh, and how you want to balance rolling resistance vs comfort.

        And even then the safety margin on bike tires is more than double the max rating, so it’s perfectly safe to go a full bar over if you want.

      • teletext@reddthat.com
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        5 days ago

        100 psi
        14400 lbf/ft^2 (pounds-force per square foot)
        1600 ozf/in^2 (ounces-force per square inch)
        689.475729 kPa (kilopascals)
        689475.729 Pa (pascals)
        6.80459639 atm (atmospheres) (unit officially deprecated)
        6.89475729 bars
        68.9475729 dbar (decibars)
        6894.75729 mbar (millibars)
        5171.49326 Torr (torr) (unit officially deprecated)
        5171.49252 mmHg (millimeters of mercury)
        203.602068 inHg (inches of mercury)
        70.30696 m WC (meters of water column)
        0.07030696 km WC (kilometers of water column)
        230.6659 ft WC (feet of water column)

        • Kitathalla@lemy.lol
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          5 days ago

          I didn’t know Torr was deprecated… For some reason that was always the number for STP I could remember in physics.

        • LifeLemons@lemmy.mlOP
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          5 days ago

          Can you give me a reading in burgers needed to achieve that pressure in my heart?

  • Grass@sh.itjust.works
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    5 days ago

    meanwhile I’m sketched out by the tires on my uncles old road bike that say max 90 psi wheras mine say like 20 or so.

      • takeda@lemmy.world
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        5 days ago

        Ok so that’s what the backup tire says 60psi.

        When I first saw it, I thought that it has to be wrong and I’m looking at the wrong number.

        • DesolateMood@lemm.ee
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          5 days ago

          When I saw it the first time, before I understood how it worked, I thought “surely this is just for long-term storage purposes and I would need to bleed some pressure if I wanted to drive on it”