ways to test a silver bar ?
greatnortherncoin
Posts: 412
how do you test a silver bar to make sure its .999 and not lead covered with silver ?
dont send sheep to kill a wolf...
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Comments
you can do what they guys did........ring test/bandsaw goof
Too many positive BST transactions with too many members to list.
<< <i>I throw mine on concrete real hard check the ring. A good rap with a 20oz hammer works too
That's the professional test, hard to perform if you don't have the necessary skills.
Otherwise, you can use the specific gravity test.
edited to add:
(by CaptHenway)
When you put a solid object in water, it displaces a volume of water. If the object weighs more than the volume of water, it sinks. If it weighs less than the volume of water, it floats. A battleship hull made of 12-inch thick steel can float because the overall hull, which is essentially hollow, displaces a greater weight of water than the weight of the hull.
Different metals are of different densities. An ounce block of aluminum is relatively large, and when placed in water displaces a large amount of water. Copper is much denser that aluminum, so an ounce of copper is much smaller, roughly one-fourth the size of the ounce of aluminum, and would therefore displace much less water than aluminum. Gold is much denser than copper, roughly one-half the size of an ounce of copper, so it displaces much less water than copper.
You can measure the density of a metal by measuring its displacement. Weigh the object normally and write down the dry weight. Then weigh it suspended in water (Ohaus makes a triple-beam balance that is great for this, because they is a place to put a beaker of water with a hook above it to suspend the object from). Write down the wet weight. Subtract the wet weight from the dry weight, write that down, then divide the difference back into the dry weight. The result is the specific gravity of the object.
If the object has a low density, the displacement of water will be large, and the s.g. will be low. Aluminum is somewhere in the 2.7 area. If the object is made of pure silver, the s.g. should be 10.49. An alloy of 90% silver, 10% copper is around 10.34. If it is pure gold, the s.g. should be about 19.5. 90% gold is about 17.14.
A margin of error of about 0.10 should be expected on an s.g. test, especially if the object if relatively small. Watch out for air bubbles forming on the object in the water, which can reduce its wet weight. A tiny drop of Ivory liquid soap can be used in the water to reduce bubbling, and surface tension where the hanger emerges from the water.
TD
<< <i>silver hitting concrete
One of the best video ever!
<< <i>
<< <i>I throw mine on concrete real hard check the ring. A good rap with a 20oz hammer works too
That's the professional test, hard to perform if you don't have the necessary skills.
Otherwise, you can use the specific gravity test.
edited to add:
(by CaptHenway)
When you put a solid object in water, it displaces a volume of water. If the object weighs more than the volume of water, it sinks. If it weighs less than the volume of water, it floats. A battleship hull made of 12-inch thick steel can float because the overall hull, which is essentially hollow, displaces a greater weight of water than the weight of the hull.
Different metals are of different densities. An ounce block of aluminum is relatively large, and when placed in water displaces a large amount of water. Copper is much denser that aluminum, so an ounce of copper is much smaller, roughly one-fourth the size of the ounce of aluminum, and would therefore displace much less water than aluminum. Gold is much denser than copper, roughly one-half the size of an ounce of copper, so it displaces much less water than copper.
You can measure the density of a metal by measuring its displacement. Weigh the object normally and write down the dry weight. Then weigh it suspended in water (Ohaus makes a triple-beam balance that is great for this, because they is a place to put a beaker of water with a hook above it to suspend the object from). Write down the wet weight. Subtract the wet weight from the dry weight, write that down, then divide the difference back into the dry weight. The result is the specific gravity of the object.
If the object has a low density, the displacement of water will be large, and the s.g. will be low. Aluminum is somewhere in the 2.7 area. If the object is made of pure silver, the s.g. should be 10.49. An alloy of 90% silver, 10% copper is around 10.34. If it is pure gold, the s.g. should be about 19.5. 90% gold is about 17.14.
A margin of error of about 0.10 should be expected on an s.g. test, especially if the object if relatively small. Watch out for air bubbles forming on the object in the water, which can reduce its wet weight. A tiny drop of Ivory liquid soap can be used in the water to reduce bubbling, and surface tension where the hanger emerges from the water.
TD >>
An object that FLOATS displaces an amount of water EQUAL to [but not greater than] its weight, while an object that sinks displaces an amount of water equal to its volume.
<< <i>
<< <i>
<< <i>I throw mine on concrete real hard check the ring. A good rap with a 20oz hammer works too
That's the professional test, hard to perform if you don't have the necessary skills.
Otherwise, you can use the specific gravity test.
edited to add:
(by CaptHenway)
When you put a solid object in water, it displaces a volume of water. If the object weighs more than the volume of water, it sinks. If it weighs less than the volume of water, it floats. A battleship hull made of 12-inch thick steel can float because the overall hull, which is essentially hollow, displaces a greater weight of water than the weight of the hull.
Different metals are of different densities. An ounce block of aluminum is relatively large, and when placed in water displaces a large amount of water. Copper is much denser that aluminum, so an ounce of copper is much smaller, roughly one-fourth the size of the ounce of aluminum, and would therefore displace much less water than aluminum. Gold is much denser than copper, roughly one-half the size of an ounce of copper, so it displaces much less water than copper.
You can measure the density of a metal by measuring its displacement. Weigh the object normally and write down the dry weight. Then weigh it suspended in water (Ohaus makes a triple-beam balance that is great for this, because they is a place to put a beaker of water with a hook above it to suspend the object from). Write down the wet weight. Subtract the wet weight from the dry weight, write that down, then divide the difference back into the dry weight. The result is the specific gravity of the object.
If the object has a low density, the displacement of water will be large, and the s.g. will be low. Aluminum is somewhere in the 2.7 area. If the object is made of pure silver, the s.g. should be 10.49. An alloy of 90% silver, 10% copper is around 10.34. If it is pure gold, the s.g. should be about 19.5. 90% gold is about 17.14.
A margin of error of about 0.10 should be expected on an s.g. test, especially if the object if relatively small. Watch out for air bubbles forming on the object in the water, which can reduce its wet weight. A tiny drop of Ivory liquid soap can be used in the water to reduce bubbling, and surface tension where the hanger emerges from the water.
TD >>
An object that FLOATS displaces an amount of water EQUAL to [but not greater than] its weight, while an object that sinks displaces an amount of water equal to its volume. >>
Right, and with the density of water set at "1", the volume of the water that is displaced is equal to the weight of the water that is displaced.
What's your point?
<< <i>
<< <i>
<< <i>
<< <i>I throw mine on concrete real hard check the ring. A good rap with a 20oz hammer works too
That's the professional test, hard to perform if you don't have the necessary skills.
Otherwise, you can use the specific gravity test.
edited to add:
(by CaptHenway)
When you put a solid object in water, it displaces a volume of water. If the object weighs more than the volume of water, it sinks. If it weighs less than the volume of water, it floats. A battleship hull made of 12-inch thick steel can float because the overall hull, which is essentially hollow, displaces a greater weight of water than the weight of the hull.
Different metals are of different densities. An ounce block of aluminum is relatively large, and when placed in water displaces a large amount of water. Copper is much denser that aluminum, so an ounce of copper is much smaller, roughly one-fourth the size of the ounce of aluminum, and would therefore displace much less water than aluminum. Gold is much denser than copper, roughly one-half the size of an ounce of copper, so it displaces much less water than copper.
You can measure the density of a metal by measuring its displacement. Weigh the object normally and write down the dry weight. Then weigh it suspended in water (Ohaus makes a triple-beam balance that is great for this, because they is a place to put a beaker of water with a hook above it to suspend the object from). Write down the wet weight. Subtract the wet weight from the dry weight, write that down, then divide the difference back into the dry weight. The result is the specific gravity of the object.
If the object has a low density, the displacement of water will be large, and the s.g. will be low. Aluminum is somewhere in the 2.7 area. If the object is made of pure silver, the s.g. should be 10.49. An alloy of 90% silver, 10% copper is around 10.34. If it is pure gold, the s.g. should be about 19.5. 90% gold is about 17.14.
A margin of error of about 0.10 should be expected on an s.g. test, especially if the object if relatively small. Watch out for air bubbles forming on the object in the water, which can reduce its wet weight. A tiny drop of Ivory liquid soap can be used in the water to reduce bubbling, and surface tension where the hanger emerges from the water.
TD >>
An object that FLOATS displaces an amount of water EQUAL to [but not greater than] its weight, while an object that sinks displaces an amount of water equal to its volume. >>
Right, and with the density of water set at "1", the volume of the water that is displaced is equal to the weight of the water that is displaced.
What's your point? >>
this
"A battleship hull made of 12-inch thick steel can float because the overall hull, which is essentially hollow, displaces a greater weight of water than the weight of the hull."
The weight of water displaced won't be greater than the weight of the hull; equal but not greater. A 100 ton ship will not displace 110 tons of water. A 3 inch round 10 pound cannonball will sink and displace an amount of water equal to the volume of the ball, approx 69 cc. The same ball rolled into a flat sheet and curved like a dish will displace 10 pounds of water.