Actual poster from 1917 that made me laugh. A lot.

Also, those motherfuckers are measuring the weight of those balls in kilograms, aren’t they?

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40 points

But we’re supposed to use Joules, not calories

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4 points

It’s demonstrative anyway

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19 points

I believe the calorie is a derived unit while the Joule is a base unit.

Somebody correct me if I’m wrong.

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11 points
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The calorie used to be the base unit, until we released in the 19th century “wait, heat isn’t a gas” and threw out caloric theory, and made the joule. Now the calorie is defined as 4.184 joules.

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2 points
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Yes, you’re right.

There have been multiple iterations of the “metric system” since it’s introduction in 1792–1795, most notably the original 1795 draft variant, then the CGS (Centimeter-Gram-Second) version, then the MKS (meter-kilogram-second) variant, with the most recent incarnation being the International System of Units (SI).

That’s why there are plenty of metric units, but not all of them are SI units. :)

 


Edit: Changed “1892–1895” to “1792–1795”. Lol, whoops.

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