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A glass of water roughly the size of a can of Pepsi is about 330ml. 1ml of pure H20 is equal to 1g, so 330g. This is about one third of a litre. 1 litre weighs 1kg in average Earth gravity, 1000kg makes one metric tonne, so 1000 litres of pure water has a mass of one metric tonne. Thus 3000 glasses of pure water is about 1 tonne. Providing you empty the water out of the glasses first before weighing the water.

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Jim Beckwith

Lvl 2
4y ago

What else can I help you with?