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...Differential thermal analysis dta thermogravimetric tg is the of a change in property sample which related to an imposed temperature usually solid state and changes that occur on heating include melting phase transition sublimation decomposition mass known as measures material function or time under controlled atmosphere its principal uses measurement s stability composition most useful for dehydration desorption oxidation processes widely used method compared with inert reference during programmed should be same until event occurs such crystal structure endothermic takes place within will lag behind minimum observed curve contrary if exothermal then exceed maximum area endotherm oxotherm enthalpy h many problems it advantageous use both because events can classified into those do not involve good example shown following fig curves al si o oh at range c there occurred corresponds this shows up second effects but effect recrystallization dehydrated kaolin process oxothermic modes determ...