this post was submitted on 14 Mar 2024
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Easy. Take a wire that is exactly 1 meter long. Form a circle from the wire. The circumference of that circle is 1 meter.
And this why you don't touch the thermostat.
uh huh. and how are you measuring that?
Now the engineers and/or scientists are crying
Scientists maybe, engineering is all about calling things close enough.
You don't need to, it's defined. (Lol). If you take a circle with a circumference of 1, then its circumference will be 1... I think I might have lost some braincells reading this.
He obviously meant to say how do you measure that it’s exactly 1m, even when still in a straight line. Exactly being the key word here.
But is the circumference of the outer circle or inner circle 1m? The wire has a nonzero width.
I don't have to measure it. I stick under glass and define it as the standard which all other measurements are derived from.
I will be measuring it in meters. One. There you go.
Ok, you got another source of water - physicists.
Plancks
Exactly. Use a laser measure to cut a plank, then use that for reference!
Laser Measure.