Here it is shown how a property is acquired with a new segment. This means that when a polymer is produced without a melting temperature by heating (T-m) or solvent and mechanical stress, new physical properties will not occur. A new segment starts from crosslinking, which takes the three steps of initiation, propagation, and termination, such as the polymerization of a vinyl monomer. An excess of crosslinking causes a crack in the resin. The boiling water absorption expresses the magnitude, which consists of a closed and open cell. The limit of the thermal elongation of the C--C-bond-composed main chain is 1% from 0 degrees C, which is a common value making possible a comparison for the general polymer, extending the C-C bond of the organic compound. An equation of the glass-transition temperature (T-g) is obtained from summation inversely to the linear coefficient of thermal expansion of each molecular unit. DNA is given as a perfect form composed of all new segments without waste; the molecular unit responds to an individual function as a condition of a living thing. T-g is a signal to change direction to the thermal elongation of the main chain for T-m; T (m)-T-g indicates a similar process in the original direction of T-g. ere is no T-m without T-g. (c) 2005 Wiley Periodicals, Inc.