When a solid changes to directly gaseous state, the process is called

When a solid melts there is

Solid carbon dioxide is converted directly Into gaseous state when the pressure is decreased to :

The process in which a substance changes directly from solid to gaseous form and vice-versa is called……..

A and B are the two solid substances. On heating they directly changes into gaseous state without undergoing liquid state. Name these two substances, and by what name this process is called?

What happens when magnetic flux passing through a coil changes continuously?Where does this process is used ?

In heterogeneous catalytic reactions involving solid catalyst and gaseous reactants, the catalysts, most generally used are

When the purc solvent diffuses out of the solution through the semi-permeable membrane then the process is called