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Why is it that 1 litre of water weighs 1 kg while this doesn't apply for other liquids?
I was just thinking about something interesting. Why is it that 1 litre of water weighs 1 kg while this doesn't apply for other liquids?
That's a good question! The reason is that the definition of a kilogram is based on the weight of a certain amount of water- specifically, one liter of water at 4 degrees Celsius. This standard was established in 1795 and is still used today.