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Old 2021-09-30, 14:04   #23
kriesel
 
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Quote:
Originally Posted by Dr Sardonicus View Post
I note that WRT mouse farts, the relevant kind of pressure is gauge pressure, the difference in pressure between inside and outside. And when it comes to breaking wind, I am skeptical that a pressure difference of a hundred thousandth of an atmosphere is going to get the job done.
1 Pa ~.102 mm H2O. Measured internal (gauge) duodenal pressure of live mice ~10. cm H2O. So a mouse fart is likely more forceful than most people realize. People mistakenly think something that small would not produce much pressure, but that is force per unit area, so scale is pretty irrelevant. Mouse internal pressures I found and posted links to previously are comparable to human internal pressures. https://courses.lumenlearning.com/ph...s-in-the-body/ Rough scale invariance must be very convenient for rural veterinarians.

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Old 2021-09-30, 16:18   #24
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Quote:
Originally Posted by Uncwilly View Post
So should on say "I drank 250 milliliter of gin last night!"? Or "My daughter was able to crawl 4 meter from her crib to the parlor."? Should not those units be plural?
Context dependent.

Informal speech uses plurals. Formal scientific writing does not, in general.
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Old 2021-09-30, 16:19   #25
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Quote:
Originally Posted by Uncwilly View Post
So should on say "I drank 250 milliliter of gin last night!"? Or "My daughter was able to crawl 4 meter from her crib to the parlor."? Should not those units be plural?
Drinking that much gin in a single sitting could well result in you having to crawl that distance rather than walk.
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Old 2021-09-30, 16:32   #26
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Quote:
Originally Posted by Uncwilly View Post
So should on say "I drank 250 milliliter of gin last night!"? Or "My daughter was able to crawl 4 meter from her crib to the parlor."? Should not those units be plural?
I agree with Xilman.

And one should probably keep quiet about having drunk that much gin the night before. Good grief, that's a third of a bottle! ("A third of a bottle" is a way of expressing it without using plurals. So is, "Way too much.")

I don't even want to think how I'd feel the next morning if I drank that much gin the night before!
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Old 2021-09-30, 17:14   #27
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Quote:
Originally Posted by xilman View Post
Context dependent.

Informal speech uses plurals. Formal scientific writing does not, in general.
Not always. "I lost three stone in six months". (Unless your name is Bill McLaren, who always used "stones" when announcing the weights of the players in the international rugby matches he was commentating on.)
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Old 2021-09-30, 17:29   #28
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Quote:
Originally Posted by BudgieJane View Post
Not always. "I lost three stone in six months". (Unless your name is Bill McLaren, who always used "stones" when announcing the weights of the players in the international rugby matches he was commentating on.)
Yes, English is wonderfully consistently inconsistent.
The 100 meter sprint requires you to run 100 meters.
I need to replace 6 60 Watt bulbs.
This is 15 A[mpere] circuit.
Apparently we are fine with singular units when used as an identifier.

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Old 2021-09-30, 17:56   #29
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Quote:
Originally Posted by sdbardwick View Post
The 100 meter sprint requires you to run 100 meters.
You pluralise the object, yes?

In "100 metre sprint" the object is "sprint".
In "100 metres" the object is the "metre".
Multiple 100 metre sprints.
Single 100 metre sprint.
Multiple metres.
Single metre.

And just for fun the spelling of met(r)e(r) is also fantastically variable.

A meter is a measurement instrument. A metre is a unit of length.
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Old 2021-09-30, 18:11   #30
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A meter is a measurement instrument. A metre is a unit of length.
Except when they're not. https://www.thefreedictionary.com/metre
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Old 2021-09-30, 23:59   #31
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Here is what Webster had to say about it in 1828:

Quote:
1. Measure; verse; arrangement of poetical feet, or of long and short syllables in verse. Hexameter is a meter of six feet. This word is most improperly written metre. How very absurd to write the simple word in this manner, but in all its numerous compounds, meter as in diameter, hexameter, thermometer, etc.

2. A French measure of length, equal to 39 37/100 English inches, the standard of linear measure, being the ten millionth part of the distance from the equator to the North Pole, as ascertained by actual measurement of an arc of the meridian.
http://www.webstersdictionary1828.com/Dictionary/meter

And the real origin:

https://translate.google.ca/?sl=en&t...r&op=translate

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Old 2021-10-01, 00:30   #32
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Old 2021-10-01, 00:47   #33
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And since you got me started on meter, in times of the great physicists such as say Einstein a meter was defined as the length of a standard Platinum-Bar that was kept in the Louvre-Museum. It probably never occurred to him to redefine a meter in terms of distance travelled by a standard entity such as sound or say light with its constant speed.
Of course now we are smarter than he or any other great physicist in the past ever was so in 1983 in a Conference, the meter (which is a unit of distance) was precisely defined as:
Quote:
To further reduce uncertainty, the 17th CGPM in 1983 replaced the definition of the metre with its current definition, thus fixing the length of the metre in terms of the second and the speed of light:[79]

The metre is the length of the path travelled by light in vacuum during a time interval of
1/299,792,458
of a second.
https://en.wikipedia.org/wiki/Metre#...ght_definition

IOW, meter (a unit of distance) is defined in terms of Speed-of-Light.

Now:

Quote:
Galileo defined speed as the distance covered per unit of time.
https://en.wikipedia.org/wiki/Speed#...cal_definition

IOW, we are defining distance in terms of speed and speed in terms of distance.
Don't we just get smarter as time goes by?

Of course to make things even more precise, both distance and time happen to be relative and not absolute.

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