Question

What is sublimation critical point?

Answer 1

The process of converting a solid into gas directly without involving any other states in between by applying a large amount of heat is called sublimation. Few solid chemicals show this type of property.

Complete step-by-step answer: - In the question it is asked what sublimation critical point is.
- In chemistry sublimation is a process in which the phase transition of a chemical occurs endothermically.
- This endothermic transition of phase occurs at lower temperature and pressure of a substance triple point in the phase diagram.
- As per the thermodynamics at triple point the substance is going to exist in its three possible different states (gas, liquid, and solid) and those states coexist in nature.
- The sublimation critical point is that the maximum or minimum pressure and temperature after which the state of the chemical substance is cannot be changed.
- The sublimation critical point of a chemical called dry ice is -78.5 $^{o}C$ means dry ice sublimates at this temperature.
- This technique is used in pharmaceutical industries to get high purity of the drugs or medicines in the span of a short time.

Note: Sublimation technique is a method, chemists use this method to separate or purify the chemical compounds. In the sublimation process a solid substance is going to be kept in vacuum at higher temperature. At this time the solid vaporizes and condenses into a pure form on a cool surface by leaving the impurities behind.