John Cuthber

It's the actual density of silver What does that mean? Is it something your model does? Do you realise that your model does not affect the density or composition of a piece of metal? How can it identify pure silver? It can't distinguish it from a silver/ copper/ gold alloy with the same density, and there are essentially an infinite series of those.

Are you deliberately missing the point? The actual density of silver is 10.49 You can invent any alloy you like with that density, and I will tell you that you have got it wrong because the real alloy it has more silver (Or less) than you suggest. Changing the silver content does not ( to a first order approximation) change the density at all. If you choose to be a bit more precise then adding silver changes the density slightly. But you can always get it back to exactly 10.49 by adding either copper or gold. So, whatever composition you suggest, I can say you are wrong. Your method simply can not work.

How do you know it isn't a 50:50 mixture of that alloy and pure silver (which has a density of 10.49)?

JaiHind15 Never mind all that tripe. I have a piece of metal with a density of 10.49 exactly. It's made from all 3 metals Ag, Au, Cu What is its composition? If you don't know, just say so.

The device rejoices in the name of an earth inductor. https://geomag.nrcan.gc.ca/lab/vm/inductor-en.php

Then your study is wrong, for the reason I gave earlier.

In the particular case of the CuAuAg system, I think the colour would give you a hint. If you measured the reflectance spectrum carefully, it would probably be sufficient. The electrical conductivity might also work, or the hardness, or the speed of sound, or the melting point or magnetic susceptibility or the electrode potential or melting point. But the point remains; you need something to tell you where on that line you are. If you are in the UK and there's a point on the line corresponding to 9 (or 18) carat gold then that's a fair bet, but no proof. But in the USA they seem to prefer 10 carat (as far as I can tell).

So... if I tell you the density of the alloy is 10.5, you can tell me it has a composition which lies on that Isopycnic line. But you can't tell me which composition it is. In other words, you can't tell me anything that Archimedes couldn't have

Am I missing something? 4 ÷ 2 =2

What "race" are these?

No, and nor can you. Feel free to post your double blind trial data if you don't agree with me.

Cast iron will crack due to uneven thermal expansion if you are not careful.

No, it's not. If you think I'm wrong, it's up to you to prove it.

The clever bit about those is not the choice of material so much as the big gaps. That means they are less troubled by expansion. They don't buckle and warp because, for the most part, they can just expand a bit. They use cast iron because it's strong enough, has a high enough melting point, and it's cheap. A sheet of cast iron would only be slightly better than a sheet of glass.

Looks like a theoretical solution in search of a problem.