Question

Demonstrate with activity that some solid can be directly converted into gas.

Answer 1

This process is called sublimation. Take a naphthalene ball/camphor/solid carbon dioxide. Keep it outside for a while. Now go back to that place and take a look. We can see that there will be no naphthalene ball/camphor/solid carbon dioxide. Coz it changes its stae of matter into vapour. The activity's completed. Hope this helps.

Answer 2

the process of converting  solid into gas directly is called sublimation

activity :-
1 keep the camphor on a table 
2 leave it for few days
3 after few days u observe that the camphor is missing
4 the camphor has converted into gas directly