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That is how a litre was redefined in 1964.

Previously, a litre was defined as the volume of 1 kilogram of pure water at 4 deg C (when it has maximum density) and a pressure of 760 mm of Mercury (one atmosphere). However, it was later discovered that the standard mass was incorrect and the litre so defined was actually 1.000028 dm3.

It was also known then that the mass-to-volume ratio of water depended not just on purity, temperature and pressure but also isotopic mixture. The link with mass was broken and the litre defined purely in terms of lengths.

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Q: How was 1 liter equal to 1 cubic decimeter?
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