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Integrated intensities of the 2900, 1460, and 1370 cm−1 infra-red absorption bands have been measured for twelve aliphatic hydrocarbons. The results are interpreted on the basis that the hydrocarbon molecule behaves like a non-interacting mixture of [Complex chemical formula] structural groups. The unit structural group intensities are 4.41×10−7, 3.81×10−7, and 1.39×10−7 cm2/(molecule second) for the CH3, CH2 and CH groups respectively in the 2900 cm−1 band; 0.544×10−7 and 0.232×10−7 for the CH3 and CH2 groups in the 1460 cm−1 band; and 0.394×10−7 for the CH3 group in the 1370 cm−1 band. Values calculated for the CH bond dipole moment divided by the equilibrium CH bond length vary from approximately 0.2×10−18 to 0.4×10−18 c.g.s. units. Values of approximately −0.75×10−10 are obtained for the change in CH bond dipole moment with change in CH bond length.