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The specific volume of partially crystalline specimens of polypropylene, poly(butene‐1), and poly(pentene‐1) from about 160°K to above the melting point has been studied. In addition, proton spin magnetic resonance of a partially crystalline poly(butene‐1) specimen has been observed over the 77°K to 320°K temperature range. Percent crystallinities as functions of temperature for polypropylene and poly(butene‐1) calculated from the specific volume data are compared. The poly(butene‐1) specimens show higher densities than the polypropylene samples at 170–180°K although the crystalliniites of the former are 25–40% lower than the latter. In addition, the temperature dependence of the specific volume from 160–280°K is greater for poly(butene‐1) than for polypropylene. Somewhat similar trends are noted in a comparison of the NMR (nuclear magnetic resonance) second moment versus temperature curves for these two materials.