Fig. 2 shows the DSC thermogram of indium under different heating rates. Fig. 3 shows plots of the onset temperature of melting vs. heating rates based on the data from Fig. 2. It can be seen that as the heating rate increased, the size of the melting peak of indium also increased, and the onset temperature To increased linearly. The linearity between the To of indium and the heating rate is very high (R2 is about 0.9981) in the heating rate range of 20 and 300 C/min. It indicates that the relationship between To and heating rate is linear. Furthermore, from the linear regression equation, the extrapolated Tp can be calculated. The result is 156.88 C that is very close to the data from handbook (156.60 C).