Question

some substances cannot exist in gaseous state ; others cannot exist in liquid state and some cannot exist in both liquid and gaseous state ; give suitable examples and justify the above statement

Answer 1

 liquid LPG at the bottom evaporates to replace the depleted gas using ... and has a boiling point of approximately 0°C, it is in gaseous state at room temperature. ... stored and transported conveniently in steel cylinders, and can vaporize ...