“…A number of techniques have been previously employed to investigate individual events involved in the physical, chemical and thermal changes as coal heats, for instance, Gieseler Plastometer [10,11] and Proton Magnetic Resonance Thermal Analysis (PMRTA) [12,13] for measuring fusibility and Rheometry [14][15][16] for viscosity; crucible swelling [10] and Audibert-Arnu dilatometer [10,11] for evaluating swelling; Thermogravimetric Analysis (TGA), Gas Chromatography (GC), Mass Spectrometry (MS), Fourier Transform Infrared Spectroscopy (FTIR) and Nuclear Magnetic Resonance (NMR) [9,[17][18][19][20][21][22] for analysing chemical changes; and Differential Scanning Calorimetry (DSC) [23][24][25] and Differential Thermal Analysis (DTA) [26] for estimating thermal changes.…”