浓度 /nóngdù/ angolul

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]