Submitted by That_Lego_Guy_Jack t3_zv5qux in askscience
Level9TraumaCenter t1_j1p72x7 wrote
Reply to comment by FireteamAccount in How is density measured in porous materials? by That_Lego_Guy_Jack
I've used nitrogen for pycnometry instead of helium; some really porous samples I've tested would cause the instrument to drift and never really settle down, but nitrogen (being heavier AND diatomic) gave "better" (faster) numbers.
Very different, but also interesting- BET surface area analysis.
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