John VanSickle wrote:
>  so a troy ounce of gold is 
> about 1.6 cm^3, which is about the volume of four and a half American 
> pennies.

That doesn't sound quite right. Here's an ounce of gold and an American 
quarter. It's just over 3 cm in diameter and about 3mm thick.

-- 
   Darren New, San Diego CA, USA (PST)
   There's no CD like OCD, there's no CD I knoooow!

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Darren New wrote:
> John VanSickle wrote:
>>  so a troy ounce of gold is about 1.6 cm^3, which is about the volume 
>> of four and a half American pennies.
> 
> That doesn't sound quite right. Here's an ounce of gold and an American 
> quarter. It's just over 3 cm in diameter and about 3mm thick.

A quarter is not as voluminous as 4.5 American pennies.

In any event, a Troy ounce is about 31.104 grams, and gold is 19.3 grams 
per cm^3 (I misremembered it as 19.2 when making my earlier 
calculation), giving a volume of 1.611 cm^3 for a Troy ounce of gold.

A coin, 3cm in diameter by 3mm thick, will be about 2.1cm^3.  What's the 
alloy content of the coin?

Regards,
John

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John VanSickle wrote:
> Darren New wrote:
>> John VanSickle wrote:
>>>  so a troy ounce of gold is about 1.6 cm^3, which is about the volume 
>>> of four and a half American pennies.
>>
>> That doesn't sound quite right. Here's an ounce of gold and an 
>> American quarter. It's just over 3 cm in diameter and about 3mm thick.
> 
> A quarter is not as voluminous as 4.5 American pennies.
> 
> In any event, a Troy ounce is about 31.104 grams, and gold is 19.3 grams 
> per cm^3 (I misremembered it as 19.2 when making my earlier 
> calculation), giving a volume of 1.611 cm^3 for a Troy ounce of gold.
> 
> A coin, 3cm in diameter by 3mm thick, will be about 2.1cm^3.  What's the 
> alloy content of the coin?

http://www96.wolframalpha.com/input/?i=1+oz+t+Au

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Invisible wrote:

> http://www96.wolframalpha.com/input/?i=1+oz+t+Au

...so a 1.1 x 1.1 x 1.1 mm block of this stuff costs £664, eh? That's 
pretty freakin' expensive, right there!

I'd hate to imagine how much a solid gold ring costs.

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On Fri, 05 Jun 2009 12:32:30 +0100, Invisible wrote:

> I'd hate to imagine how much a solid gold ring costs.

Would weigh a bit too, I think.

Jim

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John VanSickle wrote:
> A coin, 3cm in diameter by 3mm thick, will be about 2.1cm^3.  What's the 
> alloy content of the coin?

The one I posted a picture of? It's a bullion coin, so 24k or better.

-- 
   Darren New, San Diego CA, USA (PST)
   There's no CD like OCD, there's no CD I knoooow!

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Invisible wrote:
> I'd hate to imagine how much a solid gold ring costs.

Gold rings aren't pure gold, or they'd bend very easily.

http://www.bullionjewelry.com/



-- 
   Darren New, San Diego CA, USA (PST)
   There's no CD like OCD, there's no CD I knoooow!

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>> I'd hate to imagine how much a solid gold ring costs.
> 
> Gold rings aren't pure gold, or they'd bend very easily.

Sure. But they'd never ever corrode. ;-)

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Invisible wrote:
>>> I'd hate to imagine how much a solid gold ring costs.
>>
>> Gold rings aren't pure gold, or they'd bend very easily.
> 
> Sure. But they'd never ever corrode. ;-)

Um, yes? So?

-- 
   Darren New, San Diego CA, USA (PST)
   There's no CD like OCD, there's no CD I knoooow!

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Invisible wrote:
> 
> ...so a 1.1 x 1.1 x 1.1 mm block of this stuff costs £664, eh? That's 
> pretty freakin' expensive, right there!
> 

Not sure on your maths there.

A cube 1.1mm in a side has a volume of about 0.001331 cubic cm. A bit 
over one thousandth of a cubic cm.

A cube 1.17cm (11.7mm) on a side would have a volume of approximately 
1.6 cubic cm.  And that is about right for an ounce of gold.

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