evaporation

Everyday

1. Evaporation is when a liquid, usually water, slowly turns into a gas (vapour) and goes into the air. tree →
2. Evaporation can mean something slowly disappearing. tree →

In the lessons

In science, evaporation is a change of state from liquid to gas; it happens faster when it is warm, windy, and the surface is wide. It is part of the water cycle: evaporation, condensation (clouds), precipitation (rain), collection. Evaporation separates dissolved salt from water: the water leaves, the salt stays. Sweating cools you by evaporation. Phrases: the water cycle, rate of evaporation, evaporation and condensation.

Examples

• Puddles disappear because of evaporation. tree →
• Evaporation is faster on a hot, windy day. tree →
• Evaporation is part of the water cycle. tree →
• Salt is left behind after evaporation of sea water. tree →
• Evaporation of sweat cools your skin. tree →
• We measured evaporation from two dishes of water. tree →

Note

Verb: evaporate. Evaporation is the opposite of condensation (gas to liquid). Evaporation is not boiling: it happens at the surface at any temperature; boiling happens all through the liquid at 100 °C for water. Uncountable.