What defines density of chemical substances?

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Density of chemical substances is primarily defined by the mass of the substance contained in a unit volume, which varies based on the forces of attraction and repulsion between molecules. The discussion raises questions about the differences in molecular interactions, particularly comparing hydrogen and lithium. It also distinguishes between the densities of gases and condensed phases like solids and liquids. The conversation highlights the need for clarity on what type of density is being referenced. Understanding these factors is crucial for accurately defining and comparing the densities of different substances.
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What defines density of chemical substances at the same pressure and temperature?
 
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What type of density are you talking about? Mass density?
 
dextercioby said:
What type of density are you talking about? Mass density?
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.
 
Are you comparing the densities of gases or densities of condensed phases (solid, liquid)?
 
Stanley514 said:
Density of molecular substances is defined by forces of attraction and repulsion between its molecules.

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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