Question

how will you account the following diffusion in maximum in the gaseous state of a substance

Answer 1

When a substance changes directly from solid state to gaseous state without changing to the liquid state, it undergoes sublimation. Examples of substances which sublime include dry ice and ammonium chloride. ==== Another contributor continued: The process is considered to be unusual among various substances, but the truth is that it's rare only under the conditions in which human beings live, i.e., normal air pressure. There is a threshold of pressure for every substance above which the substance has no liquid phase, and passes directly between the solid and gaseous phases. Example: Above a pressure of about 214 atmospheres (3,120 pounds per square inch), water doesn't exist. At that pressure, ice thaws directly to steam at 373° C (703° F), just as dry ice does at room temperature and pressure..