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Funkerman23
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SOnner or later I need to find the
formulas that's convert weight to approximate volume... This isn't the first time I've wondered about it but too many irons, not enough fire.
EDIT: JJay was right and I feel dumb.. Well better to be dumb for a moment and learn then carry on being an idiot. Thanks!
[Edited on 16-2-2016 by Funkerman23]
" the Modern Chemist is inundated with literature"-Unknown
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JJay
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Quote: Originally posted by Funkerman23  | | SOnner or later I need to find the
formulas that's convert weight to approximate volume... This isn't the first time I've wondered about it but too many irons, not enough fire.
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Huh? You use the specific gravity (density) of the material, which is specified in something like grams per cubic centimeter. You can also account for
empty space by multiplying by (100% - empty space %). This is elementary school math.
[Edited on 16-2-2016 by JJay]
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gsd
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I am surprised that nobody has come up with "Woods Metal Heating alloy".
I came across it while searching for a patent on NaBH4 (US 2898184).
Wood's metal, also known as Lipowitz's alloy or by the commercial names Cerrobend, Bendalloy, Pewtalloy and MCP 158, is a eutectic, fusible alloy with
a melting point of approximately 70 °C (158 °F). It is a eutectic alloy of 50% bismuth, 26.7% lead, 13.3% tin, and 10% cadmium by weight. The alloy
is named for Barnabas Wood.
Given that this is a cocktail of "shunned" metals, I wonder will anybody here be inclined to "assemble" it.
https://en.wikipedia.org/wiki/Wood%27s_metal
gsd
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XeonTheMGPony
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I like my liver and kidneys too much to be bothered going any where near Cadnium in elimental form or its oxides.
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careysub
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| Quote: Originally posted by Funkerman23 |
...
SOnner or later I need to find the formulas that's convert weight to approximate volume... This isn't the first time I've wondered about it but too
many irons, not enough fire.
EDIT: JJay was right and I feel dumb.. Well better to be dumb for a moment and learn then carry on being an idiot. Thanks!
[Edited on 16-2-2016 by Funkerman23] |
You could read this very thread where I do these calculations, giving both the input data and the result.
[Edited on 16-2-2016 by careysub]
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careysub
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Over the last year the metal market price for copper has fluctuated between $2 and $3 a pound. This is a bulk market price.
If you buy copper (or any metal) in small quantities as a consumer that has been processed in some manner (like powdering, or shotting) you would
normally expect to pay a few times the metal market price, or close to $10 a pound (at that price you can get shipping included). The cheapest source
I know of for pure copper is Rotometals at $9/lb. This is a reasonable price for the pure metal.
Copper pennies, if you can acquire them at face value, are $1.46/lb, but aren't pure copper, they are an alloy that is 95% copper. But this is an
historical anomaly and resulted in a special regulation being issued by the Treasury making melting bulk pennies down illegal to prevent them from
being swept out of the circulating currency.
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careysub
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On this very thread I discuss Rose's metal, which has an mp of 98 C (vs 70 C for Wood's metal).
Two problems with Wood's metal:
1. Cadmium is a toxic, volatile metal. Cadmium's vapor pressure reaches 0.1% atm Pressure at 380C, it reaches 1% at 470 C.
2. Wood's metal costs $340/L (same as the much safer cadmium-free Rose's metal).
The 28C lower melting point for Wood's metal is not worth the toxic cadmium fumes.
For comparison (repeating the computations I made up-thread for convenience) the other metal baths discussed cost:
Aluminum pellets (from eBay seller handi-ramp510 ): $23/L
Lab Armor beads: $100/L
Copper powder: $178/L
Aluminum pellet and copper powder: $85/L
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subsecret
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What about cutting up fine steel wool? It would rust and wouldn't be compatible with magnetic stirring, but if you cut it finely enough, it would
provide great heat transfer. Use 0000 grade.
Fear is what you get when caution wasn't enough.
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JJay
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They also sell copper scrubbing pads... they aren't as fine but I think they would work well too. That could get expensive, though.
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