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Unlike other units (meter, liter, etc.) it was actually the kilogram that formed the base of a metric weight. The kilogram was selected to have the mass of one liter of water. To make the unit 'official', a platinum weight was created, whose mass defines the kilogram. Surprisingly, the mass of this weight, now kept in a vault in France, is still the definition of a kilogram - unlike other units that are based on universal constants.

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15y ago
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8y ago

it was determined using a triple beam scale

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Q: How was the actual weight of a gram determined?
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