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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