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1. Disinformation Purveyor :verified_think: (thatguyoverthere@shitposter.club)'s status on Thursday, 26-Oct-2023 19:31:15 JST Disinformation Purveyor :verified_think:
   The baby asked "why is soap slippery" so I said "because it's made out of oil". Close but I'm not entirely satisfied. Most of the fats are converted to fatty acid salts. Do those have the same properties as the oils they came from? Probably not.
   • Flick 🇬🇧 (flick@spinster.xyz)'s status on Thursday, 26-Oct-2023 19:41:23 JST Flick 🇬🇧

     in reply to

     @thatguyoverthere Is it not because soap is a surfactant? Iirc, in parts of Scandinavia where winter driving is part of the driving test they simulate the conditions for people being examined in summer by spraying the ground with soapy water.

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   • Disinformation Purveyor :verified_think: (thatguyoverthere@shitposter.club)'s status on Thursday, 26-Oct-2023 19:41:23 JST Disinformation Purveyor :verified_think:

     in reply to

     • Flick 🇬🇧
     @Flick > Surfactants are substances used to reduce the surface tension of target solutions. It has fixed hydrophilic and lipophilic groups and can be aligned on the solution surface.
     
     Probably this yes. I guess my next thought is the surfactants in soap are fatty acid salts so perhaps part of their power is derived from the hydrophobic properties of the fats.
   • verified neko :verified::verified::verified::makemeneko: (roboneko@bae.st)'s status on Thursday, 26-Oct-2023 19:41:36 JST verified neko :verified::verified::verified::makemeneko:

     in reply to
     @thatguyoverthere depends on the property :shrug_kon: things are slippery due to lack of friction. most things that can form a film on a surface will do that. slippery when wet and all that
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   • Disinformation Purveyor :verified_think: (thatguyoverthere@shitposter.club)'s status on Thursday, 26-Oct-2023 19:43:12 JST Disinformation Purveyor :verified_think:

     in reply to

     • verified neko :verified::verified::verified::makemeneko:
     @roboneko yes but wet and soapy aren't the same. I was trying to explain the extra slip from the soap because once he got the bar wet it was slipping out of his hands and we were laughing about how hard it was for him to pick up lol
   • verified neko :verified::verified::verified::makemeneko: (roboneko@bae.st)'s status on Thursday, 26-Oct-2023 19:43:16 JST verified neko :verified::verified::verified::makemeneko:

     in reply to

     • verified neko :verified::verified::verified::makemeneko:
     @thatguyoverthere for example ice cubes are remarkably slippery
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   • verified neko :verified::verified::verified::makemeneko: (roboneko@bae.st)'s status on Thursday, 26-Oct-2023 19:57:09 JST verified neko :verified::verified::verified::makemeneko:

     in reply to

     • Flick 🇬🇧
     @thatguyoverthere @Flick
     
     > derived from the hydrophobic properties of the fats
     
     yes. lipophilic being hydrophobic, more or less arising from the electrostatic properties
     
     same idea for salts being hydrophilic
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   • verified neko :verified::verified::verified::makemeneko: (roboneko@bae.st)'s status on Thursday, 26-Oct-2023 22:43:06 JST verified neko :verified::verified::verified::makemeneko:

     in reply to
     @thatguyoverthere
     
     > wet and soapy aren't the same
     
     at least a few (probably many) differences in various properties. silicon, graphite, oil, vaseline, each feels different
     
     > once he got the bar wet it was slipping out of his hands
     
     this is why I mentioned ice cubes. once you get the bar of soap wet you no longer run out of material for the film. it effectively regenerates
     
     but a dry bar of soap isn't slippery at all (assuming your hands are also dry)
     
     compare with a chunk of "solid" grease, which is incredibly slippery. that one ceases to behave like a solid as soon as you apply force to it
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   • Flick 🇬🇧 (flick@spinster.xyz)'s status on Friday, 27-Oct-2023 06:22:13 JST Flick 🇬🇧

     in reply to

     • Niclas Hedhman

     @niclas @thatguyoverthere I vaguely think Finland, don’t they have insanely stringent driving tests even by non-US standards?

     It’s not for de-icing actual roads in winter, it’s for simulating icy (slippery) conditions in controlled test environments in summer.

   • Niclas Hedhman (niclas@angrytoday.com)'s status on Friday, 27-Oct-2023 06:22:15 JST Niclas Hedhman

     in reply to

     • Flick 🇬🇧

     @Flick

     I haven't heard of any soap on the roads here. Plain old sodium chloride in most places, but other salts have been tested for reduction of car and road damages, but essentially other salts are a magnitude+ more expensive.

     @thatguyoverthere

   • Flick 🇬🇧 (flick@spinster.xyz)'s status on Friday, 27-Oct-2023 06:22:20 JST Flick 🇬🇧

     in reply to

     • Niclas Hedhman

     @niclas @thatguyoverthere Glad I wasn’t just imagining it!

     It does sound kinda fun to try in a controlled environment, and I’m sure having done so makes you far more relaxed if it happens IRL.

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   • Niclas Hedhman (niclas@angrytoday.com)'s status on Friday, 27-Oct-2023 06:22:21 JST Niclas Hedhman

     in reply to

     • Flick 🇬🇧

     @Flick

     Sorry, misunderstood.

     Yes, in Sweden too. I had my slippery road practice and test in summer and it was done on soapy roads and specially patterned tires to reduce friction (in one case) sideways.

     But it was FUN!! During winter, the practice+test is performed on ice.

     @thatguyoverthere

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