Question

The number of molecules per unit volume in gas is _______ compared to solids and liquids.

Answer 1

Solid:

• In solid, the particles are tightly packed due to the strong intermolecular attractions.
• A solid has a definite shape, volume, and mass.
• Examples are books as well as wood.

Liquid:

• In liquid, the intermolecular forces are weaker than that of solids.
• Liquid has a definite volume but the shape of the liquid is not fixed. It usually takes the shape of a container.
• Examples are alcohol as well as water.

Gas:

• The intermolecular forces between gaseous particles are negligible.
• Due to large intermolecular spaces in gaseous particles, the number of molecules per unit volume is very small compared to solids and liquids.
• Thus gases have low density compared to solid and liquid.
• Gas has no definite volume or shape.
• Examples are oxygen as well as carbon dioxide.

So, the number of molecules per unit volume in gas is less compared to solids and liquids.