Vapour Pressure & Boiling

Escaping molecules

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Vapour pressure rises steeply with temperature.
• Boiling: vapour pressure = outside pressure.
• Weaker intermolecular forces → higher vapour pressure, lower boiling point.

Steps

1. Molecules escaping
2. A balance in a closed flask
3. Everest tea
4. Evaporating without boiling
5. Which evaporates fastest?
6. Sweating it out