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Please help to Calculate volume / weight of Alumium Answered

I wish to make a mold that will take exactly 1kg (or whatever weight) by calculating the volume of the mold before construction. Therefore 1cc of aluminum will weigh? 1gram will occupy how much space? 1kg?
I know 1 could take 1kg and use it to measure displaced water, but alas do not have even close to an accurate enough scale.

Did try to figure it out from the data on wiki and other sites, but Double alas - it truly is Greek to me.

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SolarFlower_org (author)2010-01-19

Having recently discovered the joys of wolframalpha.com , let me share the love:

http://www.wolframalpha.com/input/?i=1+kg+aluminium+volume

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lemonie (author)SolarFlower_org2010-01-19

Kiteman topic-ed that last year, nice to be reminded.
But like Jayefuu has asked, why 1 Kg of Al?

Had you thought of weighing 1Kg Al and pouring it into an oversized mould?

L

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Karroo Oakey (author)lemonie2010-01-20

Live rather remotely and no scale, I'm a bit fixated on 1kg ever since the local scrap yard wouldn't part with their aluminium (or any non ferrous for that matter). Was completely baffled untill I discovered how dramatically they were underpaying for the stuff. All I wanted was a kg or 2 and would not have minded paying extra for it. So instead I've really had to work at scrounging for it. It's the dismantling of everything just in case that takes the time. A Yamaha speedo has got 2 small Al brackets inside (who 'd've guessed,  a video machine head also seems to made of it, heat sinks, hard drives, old lorry water pump housings. The list goes on but it really would have been less painful just to buy the stuff

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lemonie (author)Karroo Oakey2010-01-20

Ah right. I found a big sheet in a skip, but I guess you don't have skips in your area. I also lugged a car-battery home for the lead in in, still trying to hack it apart...

L

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Karroo Oakey (author)lemonie2010-01-21

No, no skips and people don't seem to throw things away like that. I think that furniture, gas bottles, washing machines ect left at the curb is very much a 1st world thing. You just don't see that here in a more 3rd world scenario which makes scrounging a lot harder.

I dismantled way too many batteries as a kid for the lead, until I cottoned onto sifting the sand at shooting ranges when no one was around. It was murder lugging the stuff back to the boarding school hostel though. Melted the stuff in a tin can over a methalated spirit fondue burner. I guess I had a lot more patience back then.

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I also learned a lot. For example what happens if you flip a small bar of just frozen lead with a screwdriver out of a mold with too much enthusiasm, so that it lands on your other hand.
Yep I sure learned fast.

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lemonie (author)Karroo Oakey2010-01-21

Oh yes. I learned that old woolen & (?natrural) carpets take molten-lead fairly well, synthetics would be a disaster...

L

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Jayefuu (author)2010-01-19

The volume 1kg of aluminium occupies would depend on temperature.

Wikipedia says:
Density of aluminium near room temp = 2.70g per cubic centimetre
Density of aluminium at melting point (660.32 Celcius) = 2.375g per cubic centimetre

What is it you're trying to do?

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Karroo Oakey (author)Jayefuu2010-01-20

I was thinking that if I could pore the 1st melt  i.e. all the itsy bitsy scraps from vacume cleaner parts to engine side cover pieces into a couple of molds graduating in size I'd made, the result would be of precise size therefore also weight, I'd know at a glance how much is there when doing a project  6 months hence and be able to select a bar knowing its weight (and volume) without having to weigh it on my scale. Which is a plank on a fulcrum calibrated with a bag of sugar on either end. Yeah I know it sucks. Especially when someone steals 3 teaspoons of sugar for their coffee.

Does that mean that at room temp 1kg would occupy the volume of 2.700 Liters of water?

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Jayefuu (author)Karroo Oakey2010-01-20
No sorry. Not as easy as that. Water has a density of 1000kg/cubic meter at 4 Celcius. The following table shows its density at different temperatures, you could assume 2.7 litres, you wouldn't be very far out, and considering the other margins for error I should think it'd be insignificant:

Temp (°C)Density (kg/m3)[9][10]
+100958.4
+80971.8
+60983.2
+40992.2
+30995.6502
+25997.0479
+22997.7735
+20998.2071
+15999.1026
+10999.7026
+4999.9720
0999.8395
−10998.117
−20993.547
−30983.854


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Oops, Sugarandfat's www.wolframalpha says 1kg = 370ml

I realise now that I clicked multiply instead of divide. Usually I do try to make sure that I'm not being extra shtupid before clicking "POST"

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