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concentration [concentrations]▼(proportion of substance in a mixture)noun[UK: ˌkɒn.sən.ˈtreɪʃ.n̩] [US: ˌkɑːn.sən.ˈtreɪʃ.n̩]
density [densities]▼(number of particles or other quantity contained by a given volume)noun[UK: ˈden.sɪ.ti] [US: ˈden.sə.ti]
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