The knot is non-SI but perfectly metric and actually makes sense as a nautical mile is exactly one degree meridian. kn also doesn’t clash with kN, Newtons are always written with capital N. Capitalisation generally matters. No standard abbreviation exists for nautical miles but definitely don’t use nm because newton metres.
That is, if you take all those colonial units out of there suddenly you’re left with SI units and things that work well with SI units.
Oh and a pint is 500ml, a pound is 500g, a hundredweight is 50kg (because 100 pound), and a teaspoon is rather approximate because everyone outside of North America will use an actual spoon you stir tea with. The important part is not the precise amount but distinguishing it from “a pinch” etc. I guess by extension ounces should be 25ml and 25g. While we’re at it: An inch is 25mm, and a foot an even 1/3rd of a metre while a yard is exactly one metre.
Did you know that a Newton metre is about exactly one chocolate bar metre? The work it takes to lift it in about standard gravity, that is. Very intuitive.
t for ton is a quirk in SI, you can use Mg if you want. There’s also other SI-adjacent strangeness such as the hectare, which is one hecto-are: While SI has meters for length and litres for volume somehow the are isn’t official for area.
The knot is non-SI but perfectly metric and actually makes sense as a nautical mile is exactly one degree meridian
I do admire the nautical mile for being based on something which has proven to be continually relevant (maritime navigation) as well as being brought forward to new, related fields (aeronautical navigation). And I am aware that it was redefined in SI units, so there’s no incompatibility. I’m mostly poking fun at the kn abbreviation; I agree that no one is confusing kilonewtons with knots, not unless there’s a hurricane putting a torque on a broadcasting tower…
No standard abbreviation exists for nautical miles
We can invent one: kn-h. It’s knot-hours, which is technically correct but horrific to look at. It’s like the time I came across hp-h (horsepower-hour) to measure gasoline energy. :(
if you take all those colonial unit
In defense of the American national pride, I have to point out that many of these came from the Brits. Though we’re guilty of perpetuating them, even after the British have given up on them haha
An inch is 25mm, and a foot an even 1/3rd of a metre while a yard is exactly one metre.
I’m a dual-capable American that can use either SI or US Customary – it’s the occupational hazard of being an engineer lol – but I went into a cold sweat thinking about all the awful things that would happen with a 25 mm inch, and even worse things with 3 ft to the meter. Like, that’s not even a multiple of 2, 5, or 10! At least let it be 40 inches to the meter. /s
There’s also other SI-adjacent strangeness such as the hectare
I like to explain to other Americans that metric is easy, using the hectare as an example. What’s a hectare? It’s about 2.47 acre. Or more relatable, it’s the average size of a Walmart supercenter, at about 107,000 sq ft.
The knot is non-SI but perfectly metric and actually makes sense as a nautical mile is exactly one degree meridian. kn also doesn’t clash with kN, Newtons are always written with capital N. Capitalisation generally matters. No standard abbreviation exists for nautical miles but definitely don’t use nm because newton metres.
That is, if you take all those colonial units out of there suddenly you’re left with SI units and things that work well with SI units.
Oh and a pint is 500ml, a pound is 500g, a hundredweight is 50kg (because 100 pound), and a teaspoon is rather approximate because everyone outside of North America will use an actual spoon you stir tea with. The important part is not the precise amount but distinguishing it from “a pinch” etc. I guess by extension ounces should be 25ml and 25g. While we’re at it: An inch is 25mm, and a foot an even 1/3rd of a metre while a yard is exactly one metre.
Did you know that a Newton metre is about exactly one chocolate bar metre? The work it takes to lift it in about standard gravity, that is. Very intuitive.
t for ton is a quirk in SI, you can use Mg if you want. There’s also other SI-adjacent strangeness such as the hectare, which is one hecto-are: While SI has meters for length and litres for volume somehow the are isn’t official for area.
Since as you mentioned Newtons are
Nnotn, Newton meters areNm.nmmeans nanometer.yep brainfart too many newtons in the sentence before that
I do admire the nautical mile for being based on something which has proven to be continually relevant (maritime navigation) as well as being brought forward to new, related fields (aeronautical navigation). And I am aware that it was redefined in SI units, so there’s no incompatibility. I’m mostly poking fun at the kn abbreviation; I agree that no one is confusing kilonewtons with knots, not unless there’s a hurricane putting a torque on a broadcasting tower…
We can invent one: kn-h. It’s knot-hours, which is technically correct but horrific to look at. It’s like the time I came across hp-h (horsepower-hour) to measure gasoline energy. :(
In defense of the American national pride, I have to point out that many of these came from the Brits. Though we’re guilty of perpetuating them, even after the British have given up on them haha
I’m a dual-capable American that can use either SI or US Customary – it’s the occupational hazard of being an engineer lol – but I went into a cold sweat thinking about all the awful things that would happen with a 25 mm inch, and even worse things with 3 ft to the meter. Like, that’s not even a multiple of 2, 5, or 10! At least let it be 40 inches to the meter. /s
I like to explain to other Americans that metric is easy, using the hectare as an example. What’s a hectare? It’s about 2.47 acre. Or more relatable, it’s the average size of a Walmart supercenter, at about 107,000 sq ft.
1 hectare == 1 Walmart