- Melting: The process by which a solid changes into its liquid state at a fixed temperature by absorbing heat.
- Melting Point: The fixed temperature at which a solid converts to its liquid state is called its melting point.
- Vaporisation: The process in which a liquid changes into a vapour at a constant temperature by absorbing heat.
- Sublimation: The process by which a solid directly changes into its gaseous state without becoming liquid.
- Freezing: The process by which a liquid changes into its solid state at a fixed temperature by releasing heat.
- Freezing Point: The fixed temperature at which a liquid converts to its solid state is called its freezing point.
- Condensation: The process by which a gas changes into its liquid state at a fixed temperature by releasing heat.
- Deposition: The process by which a gas directly changes into its solid state.
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