Remind me — what’s the definition of a meter?
The length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second.
Why?
Just trying to wrap my feeble American brain around these extremely intuitive measurements.
What is the definition of 1 foot imperial?
Oh yeah, 0.9144 meters.
Since 2019, the metre has been defined as the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second, where the second is defined by a hyperfine transition frequency of caesium.
Of course. It’s so obvious.
Nor obvious, but based on physical principals and highly reproducible. BTW, what’s the official definition of an inch?
Roughly the length of the last segment of my thumb. Which is roughly 1/12th the length of my foot. Which is roughly 1/3 of my stride.
Things I don’t need a vacuum and instruments that can measure the speed of light to reproduce.
A mole is a very useful unit of measurement in chemistry, but much less so in baking.
You want to know an obvious meter metric? Roughly slightly more than half my body in length. Two can play the stupid game.
In an apocalypse, the Imperial system of measurement is easier to reestablish than the metric system though that should be used with an eye to switching to metric. The USA uses both and it would be nice if things (like soda) didn’t have to list two measurements or having to ask a doctor to convert from metric to Imperial.
