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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