Question

Which of the following is used to make artificial clouds?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

Solid CO${}_2$ which is also known as dry ice is used in making artificial clouds.

It is nothing but dry ice (solid $C{O}_2)$.

Dry $C{O}_2$ is pressurized and refrigerated between $-{57}^{\circ }Cand+{30}^{\circ }C$ until it is solidified. Next, the pressure is reduced. As a result, some solid $C{O}_2$ vaporises, causing a rapid lowering of the temperature of the remaining liquid, causing liquid to solidify into a snow-like consistency. Finally, the snow-like $C{O}_2$ is compressed into either small pellets or larger block of dry ice.