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StupidLemonEater t1_j9z8n2r wrote

A goal of the SI is to limit the number of base units to the minimum number possible. There is no SI base unit of volume because you can just use cubic meters. Similarly, there is no SI base unit for surface area because square meters already fulfil that need, even though hectares exist as a non-SI but SI-compatible unit.

Liters are a metric unit (it's based on the meter and powers of ten) but it is not an official SI unit because it is redundant.

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enby-millennial-613 OP t1_j9z8vhx wrote

I'm learning a lot from this thread. I thought hectare was an SI unit lol.

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BurnOutBrighter6 t1_ja06er6 wrote

In SI there's:

m for length

m^(2) for area

m^(3) for volume.

No need for L, hectares, etc. It's glorious.

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AeolianBroadsword t1_ja0tcfy wrote

There are a lot of other metric units that aren’t SI, for example calorie, Celsius, dyne, statcoulomb.

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RandomRDP t1_ja3sfze wrote

I thought Joule was the SI unit for energy rather than calorie?

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Caucasiafro t1_j9z95dv wrote

Derived units still count as SI assuming they are coherent, coherence is the important thing here.

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