On 22 March, we celebrate World Water Day. To broaden our knowledge, we watched an educational animation entitled "World Water Day with PAH" during our chemistry lessons in grades 7 and 8. "World Water Day with PAH". We discussed the topic, trying to answer the questions: Where can we find water besides the tap? What does it mean that water is needed to make things? How do our purchases affect water resources? Do plants and animals have the same needs? Is water the source of life? We learnt about the concept of 'virtual water' - we learnt that it is the water footprint or the amount of water that is needed to produce a thing. Everything that humans produce needs water. Producing a computer consumes 26,720 litres, an average bar of chocolate: 1720 l, a pair of jeans: 7600 l. We then recalled the extraordinary properties of water that make it essential for life to exist on Earth. We worked with microscopes looking for 'life in water' in
previously prepared samples. Our aim was to detect the presence of a slipper. We tested the pH of tap water taken from an aquarium and from a watercourse in a Natura 2000 area.
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