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 Replies: 27 / Views: 6,012 |
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Valued Member
United States
419 Posts |
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Pillar of the Community
United States
553 Posts |
Hmm. density is mass/volume. You can look up the density of silver and since you know the volume, multiply them together. If your mass does not match it would not be pure.
Well theoretically that would work!
Edit: Thanks for the contest!
Edited by jdavis18
09/05/2012 11:41 pm
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Valued Member
 United States
419 Posts |
Oooooooo, close! While I guess that would work, it isn't the answer I was looking for... Your welcome! EDIT: you are allowed 1 guess per day.  Edited by HelzelsCoins
09/05/2012 11:57 pm
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Moderator
 United States
56855 Posts |
Quote:
How can you determine that a coin is NOT pure silver if you know the mass and volume of the coin? Let's try the simplest answer. By doing the tissue test? Thanks for the contest. John1 |
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Pillar of the Community
United Kingdom
2624 Posts |
Are you refering to comparing the difference of its weight in water to its weight in air?
Archimedes was taking a bath and was thinking about the purity of the kings crown, realising he wass more bouyant in the bath and also displaced water he ran down the street naked coining the phrase "eureka"
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Pillar of the Community
United States
863 Posts |
I love that Archimedes story.
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Valued Member
United States
419 Posts |
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Archimedes was taking a bath and was thinking about the purity of the kings crown, realising he wass more bouyant in the bath and also displaced water he ran down the street naked coining the phrase "eureka"
 LOL I love that story Keep the guesses coming! |
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Valued Member
United States
419 Posts |
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Are you refering to comparing the difference of its weight in water to its weight in air? No, but good guess!  |
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Pillar of the Community
United States
553 Posts |
Am I allowed to ask a question?
If so, are we allowed to include another coin or object in our answer?
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Pillar of the Community
Canada
1411 Posts |
Density=mass/volume
Silver has a density of 10.5 grams per cubic centimetre.
Therefor, If you divide the calculated mass by the volume you should get 10.5g/cm^3=mass/volume
Edited by Windchild
09/06/2012 09:47 am
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Pillar of the Community
United States
3294 Posts |
Use a magnet and if it sticks it is not silver.
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Pillar of the Community
United States
1088 Posts |
The density of pure silver is 10.5 grams per cubic centimeter. If you have the exact volume of the coin in CCs, you can calculate the weight that it would be if it were pure silver. If it differs substantially from the calculated value, it is an alloy.
Divide the mass by the volume to calculate its density. If its density isn't the same as an equal amount of pure silver, the coin has some other metal in it.
The density test can be fooled if the coin was adulterated with other metals that average out to the same density as silver, however.
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Pillar of the Community
United Kingdom
2624 Posts |
Silver is very good at electrical conduction... so measuring the resistance could tell you that it is not pure.
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Valued Member
United States
419 Posts |
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Pillar of the Community
United States
553 Posts |
I said the exact same thing... Congrats Windchild!
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Valued Member
United States
419 Posts |
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I said the exact same thing... Congrats Windchild You said Multiply, he said divide.... I will send you a prize if you want, just PM me.  |
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Replies: 27 / Views: 6,012 |
Posted 09/05/2012 10:38 pm
