Each of us uses about 120 litres of water daily, whether it is for the shower, for washing or toilet flushing.
Water is also consumed each day for agricultural and industrial products.
We use water every day: not just directly, but indirectly too.
Every product contains virtual or "hidden" water. We can not see this water, however we can calculate it.
Select the products you usually eat an drink at breakfast and find out how much virtual water you consume.
The production of 1 kilogram of roasted coffee requires 21,000 litres of water. Consequently, a cup of coffee, prepared with 7 grams of coffee beans, needs 140 litres of water.
A cup of tea (250 ml) made with 3 grams of tea leaves contains 30 litres of virtual water. A total of 9,200 litres of water are needed to make 1 kilogram of dried tea leaves.
An orange needs 50 litres of water to ripen. A 200-mililitre glass of juice requires more than one orange. So when we drink it we are consuming about 170 litres of virtual water.
To produce 1 litre of milk one needs 1,000 litres of water for the keeping and feeding of dairy cows. There are 200 litres of virtual water in a glass of milk (200 mililitres).
The cultivation of 1 kilogram of wheat consumes 1,300 litres of water. Therefore, in 30-gram slice of toast made from wheat flour, 40 litres of virtual water are included.
Because feeding dairy cows requires a great deal of water, a total of 18,000 litres of water are needed to make 1 kilogram of butter. For 1 teaspoon (5 grams) of butter, 90 litres of water are used!
The production of 1 kilogram of strawberries requires 275 litres of water and around 1,500 litres are needed to produce 1 kilogram of sugar. Unbelievably, there are 5 litres of virtual water in one teaspoon of strawberry jam (5 grams).
A total of 5,000 litres of virtual water are in 1 kilogram of cheese made from cow's milk. That makes 125 litres per 25-gram slice of cheese! Most of the water is required to produce the milk.
A great deal of water is necessary for cattle farming. One kilogram of beef requires 15,500 litres of water. Accordingly, 460 litres of water are hidden in 30 grams of roast beef!
The cultivation of 1 kilogram of oats requires 1,600 litres of water. The oats are steamed and pressed into flakes. One tablespoon of oatmeal (10 grams) contains 16 litres of water.
200 litres of water are hidden in a 60-gram egg. Most of this water is used for breeding and feeding chickens.
An apple tree requires a lot of water for photosynthesis: approximately 70 litres per apple.