Molar volume

In <a href="/facts/Chemistry/SrNqkGVm">chemistry</a> and related fields, the molar volume, symbol Vm, or 
 
 
 
 
 
 
 V
 ~
 
 
 
 
 
 {\displaystyle {\tilde {V}}}
 
 of a substance is the ratio of the <a href="/facts/Volume/aeAXCBUd">volume</a> (V) occupied by a substance to the <a href="/facts/Amount_of_substance/tQVyNLCp">amount of substance</a> (n), usually at a given <a href="/facts/Temperature/QyGe4gmj">temperature</a> and <a href="/facts/Pressure/eyc37GRG">pressure</a>. It is also equal to the <a href="/facts/Molar_mass/m2laJErl">molar mass</a> (M) divided by the <a href="/facts/Mass_density/92p6hh9I">mass density</a> (ρ):

V
          
            m
          
        
        =
        
          
            V
            n
          
        
        =
        
          
            M
            ρ
          
        
      
    
    {\displaystyle V_{\text{m}}={\frac {V}{n}}={\frac {M}{\rho }}}

The molar volume has the <a href="/facts/SI_unit/S7YLglNz">SI unit</a> of <a href="/facts/Cubic_metre/GPILKCtm">cubic metres</a> per mole (m3/mol), although it is more typical to use the units <a href="/facts/Cubic_decimetre/QKwbQz8I">cubic decimetres</a> per mole (dm3/mol) for <a href="/facts/Gas/hVVAoodV">gases</a>, and <a href="/facts/Cubic_centimetre/B8X0UHDI">cubic centimetres</a> per mole (cm3/mol) for <a href="/facts/Liquid/t9GkLWzt">liquids</a> and <a href="/facts/Solid/hj5UsXno">solids</a>.

Molar volume open-in-new

Molar volume