Key Points: Matter in Our Surroundings
- Temperature: 0 °C = 273.15 K (K = °C + 273)
- Melting point of ice = 0 °C = 273 K
- Boiling point of water = 100 °C = 373 K
- Latent heat of fusion of ice = 3.34 × 10⁵ J/kg
- Latent heat of vaporisation of water = 22.5 × 10⁵ J/kg
- States: solid → liquid (melting), liquid → gas (boiling)
- Gas → liquid (condensation), liquid → solid (freezing)
- Solid → gas directly (sublimation)