Water police

Have your classes look at how water wise your school is and their homes are: Calculate the following across the whole school: These quantities of water are approximates only. What are they for your school? Your students may like to calculate them
Washing face or hands: 2 litres
Taking a shower (standard shower head) 10 minutes: 100 litres
Taking a shower (low-flow shower head) 10 minutes : 50 litres
Taking a bath: 80 litres
Brushing teeth (water running): 4 litres
Brushing teeth (water turned off): 1 litre
Flushing the toilet (standard-flow toilet): 10 litres
Flushing the toilet (dual flush toilet): 3 litres
Getting a drink: half a litre
Washing dishes by hand: 20 litres
Running a dishwasher: 30 litres
Doing a load of laundry: 60 litres
Watering lawn: 600 litres
Washing car: 100 litres

Water

TEACHER: Donald, what is the chemical formula for water?
DONALD: H I J K L M N O.
TEACHER: What are you talking about?
DONALD: Yesterday you said it's H to O.