Question

Why sublime substances on heating directly change their state from solid to gas without passing through liquid state ?​

Answer 1

Answer:

This is because the pressure of their triple point is very high and it is difficult to obtain them as liquids. ... There are other solids whose vapor pressure overtakes that of the liquid before melting can occur. Such substances sublime; a common example is solid carbon dioxide (dry ice) at 1 atm of atmospheric pressure

Explanation:

There are other solids whose vapor pressure overtakes that of the liquid before melting can occur. Such substances sublime; a common example is solid carbon dioxide (dry ice) at 1 atm of atmospheric pressur