An equation log [10 (NA/NB)] = -0.234 + 0.874 serves to calculate NA for the 251 reported alcohol-alkane azeotropes with an average ANa of 0.050. The calculated value of NA for 1108 azeotropes involving 15 different types of azeotropes has an average ANa of 0.056. A modification of the equation gives an average ANa of 0.028 for the alcohol-alkane azeotropes and an average ANa of 0.046 for the 1108 azeotropes.

Nuclear magnetic resonance (NMR) sensors are used to determine the time variation of solid mass for a packed ice bed in an experiment of convective melting under non-thermal equilibrium conditions. The paper describes the basic experimental technique for NAFTM apparatus and feasibility for determining the solid volume fraction and ultimately the melting rate. The NMR technique provides an effective, non-destructive method for multiphase fluid study where phase change is one of the important physical phenomena. The results show a good agreement of data obtained by the NMR method with those from image-analysis method.