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GramWater is originally used in the metric system to define what a kilogram is.

When the metric system was originally developed, the standard unit for mass was the mass of a liter of water as ice, which is one kilogram.

The Celsius temperature scale (and also the Kelvin scale) is also based on water. The boiling point of water (at sea level) is 100 degres Celsius, and freezing is 0 degrees Celsius.

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13y ago

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Water is considered a special substance in the metric system because it has a density of 1 g/mL, which means that 1 milliliter of water weighs 1 gram. This makes it easier to measure volumes and masses in the metric system using water as a reference point.

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11mo ago
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Q: Why is water a special substance in the metric system?
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