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Please forgive my stubbornness, but I really would like to understand how that can be possible. Let's say we have 10 cc of microlattice, which would weigh 9 mg. Now even if we add a huge amount of air - let's say a hundred cubic metres - the overall density of the "mix" would only be 120,000,009 mg /
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It seems that it's the "by convention" which provides the "definition" which allows this to be called a solid. I tagged that phrase for a reference at one stage, but that was removed because the
Science article included that. However, the Science article was written by one of the HRL guysm which
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Statements like "with the current record of 0.9 mg/cm3 being the lowest value for any solid yet discovered" don't make much sense to me without a rigorous definition of "solid". If you allow voids in a "solid", then you could just make a big empty box with very thin sides. What's the difference?
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The stuff that is lighter than air makes only some 0.01% of the microlattice; 99.99% of it is air. Thus, residual forces (adhesion, electrostatics on some dust and organics that got stuck to it, etc) should keep it in place, but I guess any minor draft will blow it away.
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Actually, as the article (at least now) explains, the quoted density is the one it would have in vacuum; when put in normal air, some air seems to "fill holes" in the material, doubling its actual density to substantially above pure air's density.
686:/Volume = Air density. Your mistake is adding volumes, whereas air fills in the vacuum inside the microlattice (further, we neglect the tiny volume of metal when calculating the final volume and take it as volume of air).
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hardly seems impartial. Surely if there's some convention out there then should be a reference to the fact that wasn't written by one of the researchers spruiking this new metamaterial?
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https://web.archive.org/web/20150225084718/http://www.imeche.org/news/institution/all/2013/02/28/microlattice-how-revolutionary-metallic-structures-are-benefiting-global-manufacturers
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It was I who removed it. I am looking for good reference on "conventions". The
Science article doesn't offer one, but I note that air density is 1.2 mg/cc, and the past records
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This seems impossible to me. How can the overall density rise above air's density just by adding air? It would just get closer and closer to air's density, but never above. --
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Excuse me if I got this totally wrong, but... if the density of metallic microlattice is 0,9 mg/cc and air is 1,2 mg/cc - Shouldn't this stuff float then?
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100,000,010 cc = 1,19999997 mg/cc. You can keep adding and adding and adding air, but it will only get closer to - and never exceed - 1,2 mg/cc. --
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Sure it can - add air density to material density in vacuum, and the total density will exceed the air density - this is what is described above.
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were 1.0-1.2 mg/cc, i.e. they were measured (by other groups: LNL and Sandia) with air excluded. Anyway. those materials are : -->
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It probably crosses the line on "original research" to include this, but I think a fair comparison is with the
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