Submitted by That_Lego_Guy_Jack t3_zv5qux in askscience
SamQuan236 t1_j1o0n55 wrote
there needs to be a lot more context to give you a good answer.
how much material do your have? do you mind if we destroy it as part of the measurement? how accurate (significant figures) do you want the result to be? what is the material made out of? how much money do you have to spend on this?
cheap simple solutions will work for some levels, but eg crushing may be to be done under vacuum to avoid trapped gas during the crush. you may even need to heat the sample to outgas it better before crushing. assuming that it can survive heating and vacuum conditions.
you could use a sectioning method with image analysis like microtomy to get a good answer, if your sample is soft enough, and you know the density of the two phases (sponge/pore). or you can go high tech, and use ct scanning to get the same answer, provided that your sample is xray transparent enough, and fits in the scanner.
i doubt you would want to try a crush method if the sample is a pu based foam!
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