Why So Many Units?...

In article <8356ff35-ac51-4914-b088-0f91005793e7o@googlegroups.com>,
langwadt@fonz.dk says...
wrap a rope around a cylinder with 1 meter radius, pull on that rope with
the force of 1 Newton, that is 1Nm of torque, pull on the rope
with 1 Newton until you have unwound 1 meter of rope
and you have done 1 joule of work

both are 1 newton and 1 meter but there is a difference

You have done your joule by pulling 1 Newton through 1 metre. The
cylinder or its size is not relevant.

As whit3rd <whit3rd@gmail.com> explained by introducing dot-product, it
is whether the metre is measured along the movement of the force, which
is work, or at right angles, when there is no implied movement or work,
that makes the difference.

Mike.
 
On Tue. 21 Jul.-20 8:21 p.m., Clifford Heath wrote:
On 22/7/20 4:53 am, John Larkin wrote:
Here\'s my little units program.

https://www.dropbox.com/s/64rg7ko4rc7hhw7/U.zip?dl=0

I could add pressure, but we rarely deal with that.

My modeling language, the Constellation Query Language, has a syntax for
defining fundamental and derived units:

https://github.com/cjheath/activefacts-examples/blob/master/cql/unit.cql

If you use it to design a system or database with say, width and height
columns denoted in millimetres, you can query it for width*height in
square feet. The conversion will be supplied - and checked for
conformance. You can\'t query it in hours, for example.

Clifford Heath.

That\'s a Yotta Units.

Here\'s a few more

https://www.aqua-calc.com/one-to-all/electric-car-energy-economy
 
\"Ricketty C\" wrote in message
news:6669a24f-0f32-48a4-a44f-5fadb75f65dbo@googlegroups.com...
I thought the point of SI was to unify the use of units so everyone could
speak the same language? On this > ventilator I am find many ways of
expressing the same pressure and flow rates.
(..)
WTF?! Why have multiple units like this? This is all in the same field
really. People just like to use different units.
Damn them to hell!!!

Fully agreed ! Same for the languages : Why don\'t we just all speak french ?
 
On Mon. 27 Jul.-20 2:18 a.m., Robert Lacoste wrote:
\"Ricketty C\"  wrote in message
news:6669a24f-0f32-48a4-a44f-5fadb75f65dbo@googlegroups.com...
I thought the point of SI was to unify the use of units so everyone
could speak the same language?  On this > ventilator I am find many
ways of expressing the same pressure and flow rates.
(..)
WTF?!  Why have multiple units like this?  This is all in the same
field really.  People just like to use different units.
Damn them to hell!!!

Fully agreed ! Same for the languages : Why don\'t we just all speak
french ?

For the same reason USA will never go metric.
 

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