M.Phil. Crystal science strong seems self-evident; a strong is for the most part thought of as being hard and firm. Upon investigation, nonetheless, the definition turns out to be less clear. A shape of margarine, for instance, is hard subsequent to being put away in an icebox and is unmistakably a strong. Subsequent to staying on the kitchen counter for a day, a similar 3D shape turns out to be very delicate, and it is hazy if the margarine should in any case be viewed as a strong. Numerous precious stones carry on like margarine in that they are hard at low temperatures however delicate at higher temperatures. They are called solids at all temperatures underneath their dissolving point. A potential meaning of a strong is an item that holds its shape whenever left undisturbed. The appropriate issue is to what extent the article keeps its shape. A profoundly gooey liquid holds its shape for an hour however not a year. A strong must keep its shape longer than that.