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I got some new chain wax for my motorcycle and the can has a couple of symbols that weren't on the old one. Uhhhhh. I don't think that oil and wax in a spray can should have those effects, exactly? From my mid-grade chemistry knowledge, I am pretty sure this is the responsible chemical:  That last bit sure sounds like an organophosphate to me. I can see that it's something to do with the molybdenum disulfide lubricant. But why does it have to be made of not-quite-nerve gas? I am actually kind of uncomfortable using this.
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May 1, 2024 05:54
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E: ok, here's your link to the EU SDS https://www.performancelubricantsusa.com/_files/ugd/1eff34_79486e3563d542159a4ec1c09e157b30.pdf It indicates the oxymolywhatever is listed for skin irritation and sensitization, and the hazard symbols pertain to the heptane and other hydrocarbons. But, if you don't trust it, it's your lungs, man, go ahead and pitch it for some heavy gear oil or something. Phy has a new favorite as of 06:30 on May 1, 2024 |
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May 1, 2024 06:24
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I said nerds, not geeks. Imagine the nuclear catastrophes
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May 1, 2024 11:30
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... quite.
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May 1, 2024 11:45
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Rust Martialis posted:... quite. same
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May 1, 2024 16:13
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Mustached Demon posted:Someone's never been near an open bottle of glacial acetic acid. I work with peracetic acid on the regular (it's used as a sanitizer in breweries) and lordy if that poo poo won't clear out your sinuses when you're filling up a jug from the 5-gallon container. It also leaves fun little itchy white spots on your hands if you're dumb enough to not wear gloves.
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May 1, 2024 23:01
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Rust Martialis posted:... quite. Looking quickly through the insecticides in that list, they vary from "not that bad" to "banned for a reason", but none have the "this insecticide also has a nerve agent code (Amiton/VG)" energy of the phosphorothioates (as opposed to phosphorodithioate).
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May 2, 2024 02:30
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RocketMermaid posted:I work with peracetic acid on the regular (it's used as a sanitizer in breweries) and lordy if that poo poo won't clear out your sinuses when you're filling up a jug from the 5-gallon container. It also leaves fun little itchy white spots on your hands if you're dumb enough to not wear gloves. It can’t be used in sprayable form for this reason. Great for CIP and soaks, not suitable for spot application.
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May 2, 2024 03:33
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https://www.youtube.com/watch?v=X4dt1lRBMrc Pyrophoric lead nanoparticles
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May 2, 2024 23:47
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I do wonder what licenses + connections the ChemicalForce guy has because he gets the craziest and definitely not legal for most people poo poo. Like, SCI clearance but for chemistry.
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May 3, 2024 02:17
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We don't have a physics ask/tell thread, and this involves water so it's tangentially related to chemistry Everywhere on the Internet it says "water is virtually incompressible" but nobody really specifies how compressible it is. All I've been able to find was a single post in an aviation forum (??) staring that it's 0.000053% compressible This appears to be cribbed from a PDF published by xylemappliedwater says "for water, an increase of 1 atmosphere will decrease volume by about 0.000053%" I can't find any further detail on the topic. Does it compress at a linear rate? At 100bar does water compress less?
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May 3, 2024 03:08
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Hadlock posted:We don't have a physics ask/tell thread, and this involves water so it's tangentially related to chemistry There a general questions thread in SAL: https://forums.somethingawful.com/showthread.php?threadid=3781321 quote:Everywhere on the Internet it says "water is virtually incompressible" but nobody really specifies how compressible it is. There's nothing unique about water in this regard. Liquids and solids are pretty incompressible because they're already compressed, they don't have a lot of intromolecular space available to compress them. Hadlock posted:I can't find any further detail on the topic. Does it compress at a linear rate? At 100bar does water compress less? Yes. The more you compress it, the less compressible it gets. And it's non-linear with temperature.
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May 3, 2024 03:14
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Phanatic posted:There's nothing unique about water in this regard. Liquids and solids are pretty incompressible because they're already compressed, they don't have a lot of intromolecular space available to compress them.. I mean eventually poo poo goes to gently caress and you get neutronium.
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May 3, 2024 03:17
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Hadlock posted:We don't have a physics ask/tell thread, and this involves water so it's tangentially related to chemistry quote:Here’s a table of water volumes at different temperatures and pressures. Yes, water does in fact compress as you raise the pressure (no surprise here), but it doesn’t compress by much.
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May 3, 2024 03:25
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Phanatic posted:There's nothing unique about water in this regard. Liquids and solids are pretty incompressible because they're already compressed, they don't have a lot of intromolecular space available to compress them. Water is pretty hard to compress. That said, the bulk modulus of steel is 160 GN/m^2. Water is 2 GN/m^2, so there is a difference
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May 3, 2024 03:28
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So at 30,000 psi it compresses by nearly 10%! While not common in nature, that's still a lot! Presumably those numbers are for pure water being compressed by a solid If you take a glass of water that's been sitting out you ought to get a mixture of atmospheric gasses dissolved in there; that's how fish breathe, I think What happens when you compress water with dissolved gasses? Does it compress more elastically, or does the gas begin to boil out or what Edit: bookmarked the physics thread, thanks Hadlock has a new favorite as of 03:44 on May 3, 2024 |
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May 3, 2024 03:32
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Hadlock posted:So at 30,000 psi it compresses by nearly 10%! While not common in nature, that's still a lot! A mile of sea water exerts a pressure of about 150 atm, so you're not even to the second column of the table yet. Three miles down and it's compressed by about 2%. Gases are more soluble under pressure. Hence your soda fizzes when you open it, as the dissolved gases are released.
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May 3, 2024 03:44
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"What does dissolved gas do to waters compressibility is like an entire graduate physical chemistry thesis waiting to happen or at least a semester on compressibility equations of state and/or modelling. The perfectly spherical pig in a vacuum response is that compressibility is modeled as intermolecular and intramolecular springs and atmospheric species in the liquid state are going to be small enough in amount if not near enough to the springiness of a water that you can ignore it unless you're doing something really exact.
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May 3, 2024 04:13
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