Question

Name the constant temperature at which a liquid changes to its solid-state.

Answer 1

The constant temperature at which a liquid changes to its solid state is known as its freezing point.

• Freezing is the process of state change in which matter changes from a liquid state to its solid state at its freezing point.
• For example water changes into its solid state ice at 0 °C.
• 0 °C is the freezing point of water at which or below which the state change occurs.

State change-

• Matters normally exist in three states viz. solid, liquid and gas.
• The states of matters can be interchanged with the release or absorption of heat.
• State change can be understood from the flow chart given below.
• $\mathrm{Solid}\underset{\mathrm{Freezing}}{\overset{\mathrm{Melting}}{\rightleftharpoons }}\mathrm{Liquid}\underset{\mathrm{Condensation}}{\overset{\mathrm{Boiling}}{\rightleftharpoons }}\mathrm{Gas}$