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#11 BMW56

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Posted 05 March 2018 - 05:42 PM

One of my workmates found it. Not a category I would venture into otherwise. Thought the chuckle worth sharing.
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#12 Rangi1

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Posted 05 March 2018 - 07:27 PM

? Isn't m2 the SI unit for area .....spelt out is metres square or square metres or are you implying m to the power of 2


This is correct - a space 10m by 10m is 100m2 (although the 2 should be as a superscript and I don’t know how to do that on my iPad).

100m2 is not 100 m x 100m
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#13 Island Time

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Posted 05 March 2018 - 08:10 PM

actually it is - 100m2 is not the same as 100 m2

the first is 100x100 the 2nd is 10x10

pedantic, but there it is...

Shows how an empty space can mean a lot, a bit like a decimal point.


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#14 hb1849

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Posted 06 March 2018 - 09:07 AM

actually it is - 100m2 is not the same as 100 m2

the first is 100x100 the 2nd is 10x10

pedantic, but there it is...

Shows how an empty space can mean a lot, a bit like a decimal point.

No.

 

m² is the unit in both cases, not an operator on the number. To write 100x100 like that you'd have to do 100²m² -- or (100m)². Think BODMAS -- the number and the unit are formally a multiplication, so the exponent (Orders) is done first to the m in either case, and a space makes no difference. The distinction is typographical -- and the spaced version is correct in this regard.


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#15 Island Time

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Posted 06 March 2018 - 10:58 AM

Not sure I agree with that.

Yes, I understand BODMAS.

BODMAS only applies to numeric calculations, not unit types. If the m was an algebraic calculation, not a unit type, THEN we'd be in complete agreement. But its not, its a unit. A unit type has no place in BODMAS. (Bracket, Orders, Division,Multiplication, Addition, Subtraction. No units. Correctly the unit should be dropped from the equation) 

 

So, 100m2 becomes 1002.

 

Correctly read one is 100 meters squared, one is 100 Square meters.

We agree that the correct way to write it is 100 m2  


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#16 hb1849

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Posted 06 March 2018 - 11:27 AM

Technically, the unit m is part of the algebraic equation -- a very important one. For example, calculating velocity from a distance traveled over a time period:

(2m)/(5s)=(2/5)(m/s) -- you need to apply the algebra to the units along with the scalar values in order to determine what units the answer is in. It's obvious in this example, but less so when things get more complicated.

 

This is what lets us use dimensional analysis, and all sorts of useful dimensionless numbers like Reynolds number in fluid dynamics for example.


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#17 jody

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Posted 06 March 2018 - 11:54 AM

cruisin 


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#18 Jon

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Posted 07 March 2018 - 08:23 AM

Simpler is to say that one is a hectare and the other is 0.1ha
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