Then it gets worse with Pascals for pressure and Teslas for magnetic flux, the French do like their scientists!

Indeed, Here is some units used for pressure!
1 Pa or N/(m*m) (Standard)
1 bar
1 at
1 atm
1 Torr
1 psi
And here is some units for viscosity!
1 cSt (centistoke)(Standard)
1 E (Engledegree)
1 RI (Redwoodseconds)
1 SUS (Sayboltseconds)

Don't even start on beer glass sizes, especially in Australia, they have different sizes and names in every town!! Oz glasses

Actually Chris, those are the names of the capitals of each state and territory here so they reflect what you get in those states and territories (I don't know why they just didn't do list by state/territory instead of by their capitals). ;-)

Cheers.

Mesdames et Messieurs, se il vous plaît: le Système International d’unités.

Merci bien:)

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rOZZ
Music
Pictures

THose last two are particularly interesting. In the early 60's as an apprentice toolmaker, we had some American pre-war surface grinding machines in the workshop. There was a label on the wheel spindle housing reccommending that the oil to be used had to be of so many seconds Saybolt viscosity. I'm sure we had one with Redwood on it as well.

It seems that the two units for viscosity you mention is still in practice.
Sigh...
There are lot documentions about machines and their maintainence.
But no one can give an answer in a standard way...
It will take many years until the world uses the same standard.

mole for the amount of substance.

6.022x10²³

You do learn the odd thing or two working in a school.

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David
Sitting on my butt while others boldly go,
Waiting for a message from a small furry creature from Alpha Centauri.

mole for the amount of substance.

6.022x10²³

You do learn the odd thing or two working in a school.

They call that superscript?

[edit]
It looks better quoted than original.

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David
Sitting on my butt while others boldly go,
Waiting for a message from a small furry creature from Alpha Centauri.

Sorry, but a litre weight depends of what it contains. One litre of water weighs less than one litre of lead. May father, an Alpine officer in Russia, told me then when German troops saluted the Alpini with "Heil Hitler" the Alpini answered "Heil liter" (of wine, of course).
Tullio

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I think the bigger obstacle to metrication is aviation. Airlines and their pilots use the Imperial system. My brother, a former sea captain, used the nautical mile. which is different from a statute mile. A nautical mile/hour is called a knot, for historical reasons, and is still used in aviation. Pilots calculate their height in feet. I wonder what the Russians use in the ISS when they dock their spacecrafts to the ISS.
Tullio

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Whats confusing is that not even english countries know what they want.

Short ton, long ton WTF
A ton are 1000 kilos this makes sense.
short ton 907 kilo long ton 1016 kilo grmbl.

Whats feet ?
My feet or my wifes feet umpf.

0C its freezing 100C its boiling.

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With each crime and every kindness we birth our future.

Not only, but my Captain brother told me that a displacement ton is really a measure of volume and not of weight.
Tullio

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mole for the amount of substance.

6.022x10²³

You do learn the odd thing or two working in a school.

Thats Avogadro's constant.
The SI definition is currently (1967): The amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12.
It turn out to be 6.022x10²³

Now I see why it never caught on in Cape Briton in 1742.....

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The original definition was This portion of the meridian, assumed to be one ten millionth of the distance between the North pole and the Equator on a meridian running through Paris at sea level. Except they had no means of measuring that at the time! But it sounded good to the French :-)

May be, or may not. What strikes me in this is, that when already in the third century BC a fellow by the name Eratosthenes was quite able to calculate the Earth's circumference (http://www.geo.hunter.cuny.edu/~jochen/GTECH201/Lectures/Lec6concepts/Datums/Determining%20the%20earths%20size.htm), why couldn't possibly others two millennia later, perhaps even more accurately.

Current SI standard (1983) for a metre: The distance travelled by light in vacuum in 1/299792458 second.

The original definition was This portion of the meridian, assumed to be one ten millionth of the distance between the North pole and the Equator on a meridian running through Paris at sea level. Except they had no means of measuring that at the time! But it sounded good to the French :-)

May be, or may not. What strikes me in this is, that when already in the third century BC a fellow by the name Eratosthenes was quite able to calculate the Earth's circumference (http://www.geo.hunter.cuny.edu/~jochen/GTECH201/Lectures/Lec6concepts/Datums/Determining%20the%20earths%20size.htm), why couldn't possibly others two millennia later, perhaps even more accurately.

Current SI standard (1983) for a metre: The distance travelled by light in vacuum in 1/299792458 second.

Isn't the second defined in terms of a certain number of oscillations of a particular atom at NTP? That seems to be getting rather close to circular definitions, although not quite there yet. :D

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Happy Crunching,

Graham

The original definition was This portion of the meridian, assumed to be one ten millionth of the distance between the North pole and the Equator on a meridian running through Paris at sea level. Except they had no means of measuring that at the time! But it sounded good to the French :-)

May be, or may not. What strikes me in this is, that when already in the third century BC a fellow by the name Eratosthenes was quite able to calculate the Earth's circumference (http://www.geo.hunter.cuny.edu/~jochen/GTECH201/Lectures/Lec6concepts/Datums/Determining%20the%20earths%20size.htm), why couldn't possibly others two millennia later, perhaps even more accurately.

Current SI standard (1983) for a metre: The distance travelled by light in vacuum in 1/299792458 second.

Isn't the second defined in terms of a certain number of oscillations of a particular atom at NTP? That seems to be getting rather close to circular definitions, although not quite there yet. :D

Current SI definition (1967) for a second: The duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.

I think atomic clocks are using this and that the GPS system are using it.
The GPS system needs very accurate timing to make it work.
The Clocks are also updated frequently to adjust them for the time dialation because of the lesser gravity the satellites are subject to.

Ok this is my last post in this thread, you made me do it....

I thought that a second was precisely measured at:

One Mississippi!


Ok that will do for now.

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Maybe you are just hearing the fading, fading echoes of the long lost British Imperialism?

My point exactly...... (he he.)

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Thats Avogadro's constant.
The SI definition is currently (1967): The amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12.
It turn out to be 6.022x1023

The original definition was This portion of the meridian, assumed to be one ten millionth of the distance between the North pole and the Equator on a meridian running through Paris at sea level. Except they had no means of measuring that at the time! But it sounded good to the French :-)

Current SI standard (1983) for a metre: The distance travelled by light in vacuum in 1/299792458 second.

Sounds to me like overly self-important scientists came up with these definitions to fit commonly used units because they rightly knew it would be easier than trying to train the world to use newer but more logical units.

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David
Sitting on my butt while others boldly go,
Waiting for a message from a small furry creature from Alpha Centauri.

So like one meter is the distance travelled by light
in vacuum in 1/299792458th of one Mississippi?

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How about we compromise and use F. for temperature. Base Ten for currency. And metric for disatnce and measurement.
And let the geeky scientist use what ever else they want.

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[/quote]

Old James