Question

your mother preserves woolen clothes using napthalene balls,which disappear after sometime Give reasons

Answer 1

By absorbing heat energy from the surroundings, naphthalene balls slowly sublime, i.e.,solid naphthalene balls directly get converted into vapours and disappear with time without leaving any solid.

Answer 2

Explanation:

When a solid converts directly into gaseous form without undergoing liquid form then this process is known as sublimation.

For example, naphthalene balls reduce in size when kept for a long period of time due to sublimation.

So, when your mother preserves woolen clothes using naphthalene balls then heat from the atmosphere or surroundings is absorbed by these balls. As a result, naphthalene balls change directly into gaseous state as they tend to sublime with a period of time.