A sample is at the temperature and pressure indicated by point (c) on the phase diagram below. What phase is present after the pressure is increased to the critical pressure at constant temperature? A. Gas B. Liquid C. Solid D. Supercritical fluid E. More than one phase is present a. Temperature (not to scale) Solution Since , point \"a\" lies in the zone of high pressure and low temperature , it must be solid. Similarly, point \"c\" lies in the zone of high temperature and low pressure . So, it must be gas. So, it is quite logical that the remaining part in which point \"b\" lies is of liquid. Now, coming to the question, with the help of diagram, it is clear that if we, starting from point \"c\", increase pressure up to critical pressure keeping temperature constant , gas will be converted to liquid state. So, the correct answer is \"B\". .