Melting & Boiling

Latent heat

An interactive lesson with 7 steps, about 6 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• During melting and boiling, the temperature stays constant while heat is absorbed.
• Latent heat: $Q = mL$. Water: 334 kJ/kg to melt, 2260 kJ/kg to boil.
• Evaporation cools: that’s how sweating works.

Steps

1. Stuck at zero
2. Heating curve
3. Melt the ice
4. Sweat
5. Boiling it away
6. Feed it heat
7. Ice in a drink