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In SI measurements, a whole has no prefix.

Getting smaller progressively from the whole, the prefixes go: deci-, centi-, milli-, micro-, nano-, pico-.

Getting progressively bigger from the whole, the prefixes go: deca-, hecto-, kilo-, mega-, giga-, tera-.

So gram comes first as it is the unit. The others are just multiples of this unit to make the numbers easier.

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10y ago

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