• Kecessa@sh.itjust.works
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    11 months ago

    Safety razors with disposable blades were introduced about 120 years ago, at one blade a day that’s a bit less than 45000 blades

    Double edged blades dimensions are: 0.1mm x 42.7mm x 22mm for 98.21mm³

    45 000 blades would take a volume of 4 419 450mm³ or about 270in³

    A regular indoor wall is made of 2x4 and each stud is 14.5 inches apart (16 inches on center). A 2x4 is in truth 1.5" x 3.5" so each inch of height inside the wall is 3.5 x 14.5 x 1 which is 50.75in³

    45 000 blades stacked perfectly would therefore use 270 / 50.75 = 5.32 inches of the wall’s height… So even if they didn’t stack perfectly, it’s pretty safe to assume that there’s enough space inside the wall for hundreds of years at one blade a day (especially since old houses usually used true 2x4 and had their studs at 24" on center)

    • redcalcium@lemmy.institute
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      11 months ago

      One blade a day?!! Are you a billionaire or something? The acceptable signal to replace the razor is when the pain from the dull blade pulling your hairs makes your eye watery, and then you try to man up for a couple more shaves before accepting defeat and put in a fresh blade.

    • prowess2956@kbin.social
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      11 months ago

      Also, most people use blades for more than one day’s shave. I think more like 3 - 7, depending on the blade and how picky the shaver (I get more than seven shaves per blade).

    • elrik@lemmy.world
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      11 months ago

      0.1mm seems awfully thin for a double edged blade.

      It’s also unreasonable to assume they will stack anywhere close to perfectly.

      My guess is you’re off by at least a factor of 20.

      • Hagdos@lemmy.world
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        11 months ago

        While true, 1 blade a day for 120 years is also off by a factor of 20 in the other direction.

      • Kecessa@sh.itjust.works
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        11 months ago

        Number came from Feather

        I already covered the “don’t stack perfectly” thing, but the vast majority would still fall flat.