US units to SI units 2

[espus81]

Hello, probably stupid but cant find a reliable answer on Google.

I`m reading McCormac`s

on shear walls and i`m wondering how to translate the applied force in the calculation example on the shear wall to Newtons. Please see attached picture.

 

[robyengIT]

I said "even if correct".
I always knew "kilo" as = 1'000, so "kg" for me is "1'000 * g" and therefore 10^-6 are milligram and not microkg, as said by NIST. For me is normal, logical and rational; it can't be anything else. No need of any explanation.

 

[IRstuff]

If that were the case, the the gram would be the base unit, since the prefixes are attached to the base unit, and therefore, as stated by NIST, the kg is an anomaly, since the base unit prefixes would be applied to the kg, resulting in milli-kilogram to describe the gram.

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[ThomasH]

@robyengIT
Actually, yes. You should read more carefully as already stated. What I wrote was that kilogram is the only SI base unit with a prefix.

For example kilometer, meter is the base unit.

https://en.wikipedia.org/wiki/SI_base_unit

When I read furter in the thread I see that it has been discussed. You could call kg an anomaly but it is still true. kg is the base unit. There are thing in the imperial system that I find odd as well .

Somebody also wrote that k for "kilo" is the only prefix >1 not being a capital letter. That is actually not completely true, h hecto (100) and da deca (10) are both like that. But above kilo they are all capital.

https://en.wikipedia.org/wiki/Metric_prefix

Thomas

 

[Settingsun]

Never seen hecto and deca used in any context and they're not necessary.

 

[BAretired]

How about decathlon?

Or decalog, decagon, decapod or decahedron?

BA

 

[IDS]

And how about the hectare? (which has the convenient property of being pretty close to 2.5 acres).

1 hectare = 100 ares = 100 x 100 m2.

I have never seen the are used as a unit of area though.

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[IRstuff]

It is rarely used except in certain specific applications:

hectopascal (hPa), in meteorology, for atmospheric pressure, the modern equivalent of the traditional millibar.
hectolitre (hl or hL), in agriculture, for liquids (notably wine and milk) and bulk commodities (e.g., grain).
hectogram (hg), in agronomy, for quantities of animal feed (hectogram/animal) and for measures of agricultural productivity (hectogram/hectare); also used in Italy abbreviated as etto, and in Canada, New Zealand and Sweden simply as 100 g, for retail sale of cold cuts and meat.
hectometre (hm), in radio astronomy, occasionally used to indicate a radio band by wavelength
hectare (ha, or 100 ares), in surveying, as a measure of land area equal to one square hectometre, 1 (hm)2 = 10,000 m2

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[ThomasH]

I would say hecto is quite common as exemplified by IRstuff.
I recently bought a hecto of roast beef. Don't tell a european salesman for food that hecto is an unnecessary prefix .

The first time I heard the term deca was i France, 1 kg = 1 decaNewton.

Thomas.

 

[klaus.]

I'am happy to live in the modern world where we use metric and Si units only

 

[Ussuri]

ISO standard cargo straps and lashings are specified in terms of decaNewtons.

 

[rb1957]

"The first time I heard the term deca was i France" … what, never heard "decade" ?

another day in paradise, or is paradise one day closer ?

 

[BAretired]

Not to be confused with "decayed".

BA

 

[klaus.]

yes...the french guys like to use different things
The like to use dN ( deca Newton) because it is the same as kg
So no need to tranfer numbers
1 dN = 1 kg

 

[ThomasH]

@rb1957.
I could have been clearer. The first time I heard it in that context.

But I have never heard anybody talk about "kiloyears". I think that often when kilo is used it means kilograms, just as hecto means hectograms. We skip the "grams".

Thomas

 

[klaus.]

Well we use KILOmeter too ...
1000 m = 1 km

 

[cal91]

What's the significance of kilogram being the "base" ? Or, why do we call it the "base" if everything is described in terms of grams?

 

[klaus.]

Kilo means 1000

so instead of writing 500000 grams I can write 500 Kg ...
makes Numbers look better to read

 

[cal91]

Kilo means 1000

so instead of writing 500000 grams I can write 500 Kg ...
makes Numbers look better to read

That is true of every unit.

Instead of writing 500000 meters I can write 500 Km.

I don't see why it's significant we call the kilometer the base. What's the definition of a "base" ?

 

[klaus.]

I dont know what you mean ??

 

[IRstuff]

The base unit is what's physically defined; up til this year, there was a physical chunk of metal that had a mass of 1 kg, stored in France with copies distributed with major national laboratories, like NIST and NPL. That was changed to be

kg = h / (6.62607015*10^-34 * m^2 / s).

where m = distance traveled by light in a vacuum in 1/299792458 s
and s = duration of 9192631770 cycles of radiation from the ground-state hyperfine transition of caesium-133

By the rules of usage, kilo, pico, etc., are applied to the base unit which, for the kilogram, means that a gram should be expressed as a milli-kg, but it's not, hence the exception.

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