Melting temperature (T) can be divided in two steps of (T-m-T-g) and T-g in the glass transition temperature. There are respective segments in both steps. The difference of elongation, which causes a separation between two arrays in segment, is of two kinds: mechanical and thermal. T-g is given as disappearance of the segment, which would not be so if the kind of elongation were the same. A prefix of micro at Brown on T-g is meaningless, because the segment can be explained from a different point view the phenomena shown as a sign of melting at T-g. T-g between polymer and components of C-C bond in repeat unit is given as T-g = Sigma[1/n(1%)a(i)] = Sigma[(1/n)T-gi], where alpha(i) is the linear coefficient of thermal expansion, n is the total number of components, T-gi, alpha(i) is the value of component i. A magnitude of elongation of component C-i is given as alpha(i) with the result, which the side chains have functioned like a weighting function. Strength of linear polymer is connected with the total number of segments. (c) 2007 Wiley Periodicals, Inc.