- The water is absorbing sunlight
- If a substance absorbs solar energy then that substance will increase in temperature
- Water is a kind of substance
- So, the water will increase in temperature

- The water will increase in temperature
- Temperature is a measure of heat energy
- So, the water will increase in heat energy

- The water will increase in heat energy
- Evaporation means a substance changes from a liquid into a gas by increasing heat energy
- Water is a kind of substance
- Therefore, the water will evaporate

So, the water will evaporate
If left in the sunshine, water in an open jar will
- The water is absorbing sunlight 
- Evaporation means a substance changes from a liquid into a gas by increasing heat energy 
- If a substance absorbs solar energy then that substance will increase in temperature 
- Temperature is a measure of heat energy 
- Water is a kind of substance