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Simple Specific Gravity tester
I saw a writeup in CW, NN, or WCN on a simple $10 device to measure specific
gravity using an electronic scale. I misplaced the article. Anyone have the information? Thanks Phil |
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Simple Specific Gravity tester
Phil wrote:
I saw a writeup in CW, NN, or WCN on a simple $10 device to measure specific gravity using an electronic scale. I misplaced the article. Anyone have the information? Thanks Phil http://mendosus.com/sg.html -- Jeff R. |
#3
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Simple Specific Gravity tester
"Jeff R." wrote in message u... Phil wrote: I saw a writeup in CW, NN, or WCN on a simple $10 device to measure specific gravity using an electronic scale. I misplaced the article. Anyone have the information? Thanks Phil http://mendosus.com/sg.html -- Jeff R. Wow, thats awsome! You know, I've got a science degree and been a science teacher for 2 year now and I had never learnt how to measure SG, I suppose I was never in the right place at the right time to learn it. It also seems like its just as easy to measure the density of something as long as you know the density of water at the temperature and pressure you're using. I might try making an experiment for my students where they can calculate the SG's of a few things. What would be cool is if I could find a fake silver coin, they could try and work out which of 2 coins is real. Of course all the real silver coins I have are 90% at best but could still be an interesting experiment. Anyone have some fakes in Australia that they'd like to get rid of? Andy |
#4
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Simple Specific Gravity tester
Andy wrote:
... Anyone have some fakes in Australia that they'd like to get rid of? Andy May I send you one M.Turnbull? More sensibly - may I suggest you do a comparison between a pre'46 Aussie florin and a post-'46. The pre is Sterling (92.5%) and the post is 50%. Should be a piece of cake to detect - even for school kids. Easy to source the coins, too. -- Jeff R. |
#5
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Simple Specific Gravity tester
"Andy" wrote in message ... "Jeff R." wrote in message u... Phil wrote: I saw a writeup in CW, NN, or WCN on a simple $10 device to measure specific gravity using an electronic scale. I misplaced the article. Anyone have the information? Thanks Phil http://mendosus.com/sg.html -- Jeff R. Wow, thats awsome! You know, I've got a science degree and been a science teacher for 2 year now and I had never learnt how to measure SG, I suppose I was never in the right place at the right time to learn it. It also seems like its just as easy to measure the density of something as long as you know the density of water at the temperature and pressure you're using. I might try making an experiment for my students where they can calculate the SG's of a few things. What would be cool is if I could find a fake silver coin, they could try and work out which of 2 coins is real. Of course all the real silver coins I have are 90% at best but could still be an interesting experiment. Anyone have some fakes in Australia that they'd like to get rid of? Andy When you're doing the teaching, don't forget to explain to your students any practical reasons for determining the specific gravity of something. I always had a "why would anyone ever need to know that?" feeling with many of my high school science and physics experiments. |
#6
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Simple Specific Gravity tester
"Bruce Remick" wrote in message ... "Andy" wrote in message ... "Jeff R." wrote in message u... Phil wrote: I saw a writeup in CW, NN, or WCN on a simple $10 device to measure specific gravity using an electronic scale. I misplaced the article. Anyone have the information? Thanks Phil http://mendosus.com/sg.html -- Jeff R. Wow, thats awsome! You know, I've got a science degree and been a science teacher for 2 year now and I had never learnt how to measure SG, I suppose I was never in the right place at the right time to learn it. It also seems like its just as easy to measure the density of something as long as you know the density of water at the temperature and pressure you're using. I might try making an experiment for my students where they can calculate the SG's of a few things. What would be cool is if I could find a fake silver coin, they could try and work out which of 2 coins is real. Of course all the real silver coins I have are 90% at best but could still be an interesting experiment. Anyone have some fakes in Australia that they'd like to get rid of? Andy When you're doing the teaching, don't forget to explain to your students any practical reasons for determining the specific gravity of something. I always had a "why would anyone ever need to know that?" feeling with many of my high school science and physics experiments. Good thinking Jeff, I'll do that. Yes, thats the whole idea of the experiment, to give some relevance to the things they're learning. Pitty gold is so expensive, it would be good to make a gold crown (head piece, not the coin) and compare it to a non-gold one. Thanks, Andrew |
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