Pupils cannot differentiate between the Condensation and Evaporation process.

• Liquid Gas Evaporation process

• Gas Liquid Condensation process

1. Pupils must know the terms • i. Evaporation is the process when a liquid changes

into gas. Takes place at the surface of a liquid at room temperature.

• ii. Condensation is the process when water vapour is cooled and it changes to water which is the liquid state.

2. A hands on activity. CondensationPlacing ice cubes in drinking glass to make it about ¾ full.

Watch the glass - condensation will appear on the sides. This is because the frozen water is changing state and absorbing latent heat to do so.

Aiding Evaporation

Tint a jug of water with a few drops of food colouring, and pour equal amounts of water into three saucers.

Mark the water level in each saucer. Put one saucer outside in sunlight, one in shade, and one inside.

Check the saucers twice a day. As the water evaporates, mark the new levels. See which evaporate most quickly, and make a note of how long it takes to empty each saucer.

• 3. Memorize the processes

EVAPORATION

CONDENSATION

Liquid Gas

• If pupils are confused in the usage of the word and definition of Evaporation and

Condensation, they are advised to follow this simple method:-

In order to remember better.

Gas going up

Like water droplet