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What defines density of chemical substances?

  1. Nov 9, 2014 #1
    What defines density of chemical substances at the same pressure and temperature?
  2. jcsd
  3. Nov 9, 2014 #2


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    What type of density are you talking about? Mass density?
  4. Nov 9, 2014 #3
    Density of molecular substances is defined by forces of attraction and repulsion between its molecules. I wish to know why hydrogen molecules, for example, repulse each other much more than say, Lithium molecules.
  5. Nov 9, 2014 #4
    Are you comparing the densities of gases or densities of condensed phases (solid, liquid)?
  6. Nov 9, 2014 #5


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    IDK about that. I always thought the density of a substance was defined by how much mass of the substance was contained in a unit volume. Can you provide another source for your definition of density?
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