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6291967 
Journal Article 
The molar volumes of liquid methane and deuteromethane 
Bellemans, A; Fuks, S; Legros, JC 
1965 
31 
4 
606-612 
The molar volumes of liquid CH4 and CD4 have been measured between 98 and 112°K with a relative accuracy of about 2·10−4. The molar volume of CH4 is about 1% larger than that of CD4 over all this temperature range. This difference is tentatively interpreted as resulting from (a) a translational quantum effect and (b) small differences in the intermolecular forces.