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Quote: millimeters are much more accurate than fractions of an inch
I think accuracy has more to do with the measuring device and the measuror than the scale. 
I make my own beer. The mix I buy (comes from UK), makes 23 liters. I make my beer in a one gallon jug. My observation: It would be much better for my beer making if the UK made the change. 
>64
It’s weird being the same age as old people. Live every day like it is your last; one day, it will be.
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TNCaver wrote: millimeters are much more accurate than fractions of an inch.
1mm < 1/16", but the accuracy depends on the tool used to measure. A measurement with a metric ruler is likely to be less accurate than a measurement with an imperial caliper.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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As you point out it depends on the tool used. I have a metal ruler with metric on one side and imperial on the other. Millimeters are more granular than fractions of an inch, and it seems like so many measurements go somewhere in between the 1/16th inch markers but are closer to the mm markers. I don't own any calipers...
There are no solutions, only trade-offs. - Thomas Sowell
A day can really slip by when you're deliberately avoiding what you're supposed to do.
- Calvin (Bill Watterson, Calvin & Hobbes)
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I have a steel rule from my apprentice days with divisions of 1/32" for the first inch then 1/16" thereafter. You can measure to the nearest 1/32" with it pretty easily (it has the temperature at which it is correct engraved on it, too). As has been already said, the units don't affect the accuracy, it's how you measure.
Someone on farcebook claimed the reason the USA uses Fahrenheit is because it's more accurate than using Celsius - same disclaimer applies. Celsius (and Kelvin) and the metric (SI) system are easier for scientific calculations because the various constants have been defined in terms of those base units. You'd have to do all your calculation in terms of fractions of a foot and pound though, if you wanted to use imperial. It's convenience, really.
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TNCaver wrote: millimeters are much more accurate than fractions of an inch.
As others have pointed out, accuracy has more to do with the measuring device than anything else.
Metric's benefit is all in conversion, where all you have to do is move the decimal when you need more precision or align the decimals when you need to do calculations. It's a lot quicker to add up a series of numbers then a series of fractions, when the denominator is different for every figure you have to include.
Don't get me started on the US vs Imperial gallon, or ton or...a lot more additional units than I ever knew about (based on a quick ChatGPT search, asking about other measurements that aren't the same but share the same name). WTF, a meter is a meter, there's no uncertainty about that.
Anyway. It's really not up to me to try to put forth arguments for or against; this has been debated ad nauseam.
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dandy72 wrote: It's a lot quicker to add up a series of numbers then a series of fractions...
Aye, I did say "it makes the math a lot simpler."
dandy72 wrote: Don't get me started on the US vs Imperial gallon, or ton or...
The US and OK 'acre' is the same size, but in the States we have the regular acre (43,560 sq ft), and then we have the Builder's acre, and even 40,000 sq ft, used in real estate marketing supposedly to simplify the math, but feels dishonest to me.
There are no solutions, only trade-offs. - Thomas Sowell
A day can really slip by when you're deliberately avoiding what you're supposed to do.
- Calvin (Bill Watterson, Calvin & Hobbes)
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Instant diet 
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Meters, of course. Imagine the mass confusion if we start measuring fruit, vegetables etc. in kilometers!
Religious freedom is the freedom to say that two plus two make five.
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We can already have a yard of grass.
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In Norway, we have the area unit 'square liter'. That is the floor area covered by beer if you tip over two full half liter glasses.
Religious freedom is the freedom to say that two plus two make five.
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The link in your signature is broken.
The difficult we do right away...
...the impossible takes slightly longer.
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They should carefully weigh that decision before making it.
"A little time, a little trouble, your better day"
Badfinger
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Just switch everyone to Newtons and be done with it.
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RainHat wrote: Just switch everyone to Newtons and be done with it.
Or to Einsteins for relative units
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I'd just like to say "Litres, gallons, pints, cubic centimetres" - which, I think, speaks volumes.
(coat on, door closing behind me ...)
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The basic lumber for building here in the US is called a "2 by 4" -- a piece of wood (usually pine) that many years ago was 2 inches by 4 inches by some length (such as 8 feet long).
Today that piece of wood in a lumber yard is actually 1.5 inches by 3.5 inches by some length. Not sure why the size shrunk other than saving a few dollars for the lumber mill.
As a typically uninformed American, what is the basic equivalent piece of lumber elsewhere in the world?
These are the deep questions retirement allows me to ponder.
Best wishes from Minnesota - Craig
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In much of the rest of the world, people no longer build with wood - it's either too expensive or subject to conservation laws. As you pointed out, even in the US they have reduced the amount of lumber going into a house by going from a 2"x4" standard to 1.5"x3.5". They may use more yards of lumber to compensate for the reduced structural strength, but I'm certain that less lumber is needed overall.
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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Also in Sweden wood used to be sawn into lumber measured in inches with 2 by 4 being the most common. The old Swedish inch was 24.5 mm instead of the 25.4 mm used in the US though.
Going metric these measures became 50 by 100 mm instead. But these measures were the green wood and raw sawn. After drying it shrinks a bit.
The wood sold nowadays is usually planed or surfaced some way shrinking the size a bit more, so the standard 2 by 4 is actually measuring 45X95 mm.
Some googling gives that the same story applies also for the US, 2 by 4 (1½X3½) are 38X89mm after drying, green measures are 40X90mm
Seems like US saw mills are actually working in metric until the wood goes on sale.
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Y
eah, it would be for a time. After spending over a decade in a country using meters and kilos, I
can handle either system.
CQ de W5ALT
Walt Fair, Jr.PhD P. E.
Comport Computing
Specializing in Technical Engineering Software
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The question is: Are you willing to abandon one of them?
Does your answer depend on which one of them?
Religious freedom is the freedom to say that two plus two make five.
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My ISP reset my Modem yesterday not sure if that is the issue
I have not seen any feed in my In Box since 9/1/24
I can login if I go to the website. NO ISSUES
Did something change ?
Suggestions Appreciated
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M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
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