Question

Explain why, a small volume of water in a kettle can fill a kitchen with steam .

Answer 1

A small amount of water even has molecules and there is open space in kitchen and the molecules of air move around and fill the kitchen.

Water in its liquid state, the molecules are much closer together.
Water when boiled turns into a gaseous state.
The molecules move much further apart as a result of heating.

That's why a small volume of water in a kettle can fill a kitchen with steam.

It also helps if the kitchen isn't very dry because if it is, the steam will be absorbed into the dry environment to a point and then steam will fill the room.