Mysterious Disappearances
Raveen wrote:QUOTE (Raveen @ Nov 12 2010, 03:22 PM) The kg is related to the mass of water for a given standard volume. If you pick 1m as your base unit of length then the g should be the mass of 1 m^3. Of course, it isn't (it's 1mm^3 iirc)
You're wrong, the old definition was:
10 cm x 10 cm x 10 cm = 1 dm³ = 1 liter has a weight of 1 kg at 4°C at 0 m above sealevel
Edit:
A 1 mm³ of water has only a weight of 0.000001 kg.
Last edited by pkk on Fri Nov 12, 2010 2:31 pm, edited 1 time in total.
The Escapist (Justin Emerson) @ Dec 21 2010, 02:33 PM:
The history of open-source Allegiance is paved with the bodies of dead code branches, forum flame wars, and personal vendettas. But a community remains because people still love the game.
Yes, I know that a kg is 10cm^3, that doesn't excuse the fact that it's a dumb way to distribute your base units. Given that the metric system is based on the meter you should derive the other base units (g, l, N, and so on) directly from it.
Spidey: Can't think of a reason I'd need to know anything
Most interesting article. Still incredible difficult to determine exact 1Kg tho.
http://en.wikipedia.org/wiki/Kilogram#Early_definitions
http://en.wikipedia.org/wiki/Kilogram#Early_definitions
This discussion reminds me of the discussion we had in physics class one day.
You contact a alien race by Hyper-radio
You have established a language you can bothe understand.
you want to describe all your frames of measurement to them.
How?
I suppose you can refer to an atom adn it's decay rates to arrive at a definition of time (if they have the same understanding of the atom as us).
Once you have that you could describe length in terms of the speed of light (I suppose).
Can't remember how you would describe force and weight etc.
I'm probably remembering this badly, but it's an interesting question if framed correctly.
You contact a alien race by Hyper-radio
You have established a language you can bothe understand.
you want to describe all your frames of measurement to them.
How?
I suppose you can refer to an atom adn it's decay rates to arrive at a definition of time (if they have the same understanding of the atom as us).
Once you have that you could describe length in terms of the speed of light (I suppose).
Can't remember how you would describe force and weight etc.
I'm probably remembering this badly, but it's an interesting question if framed correctly.
Last edited by notjarvis on Fri Nov 12, 2010 3:31 pm, edited 1 time in total.
Even more incredible difficult procedures to have 1 Kg. I
http://www.bipm.org/en/scientific/mass/
Now it gets really silly
http://www.bipm.org/utils/en/pdf/Monographie1990-1-EN.pdf
http://www.bipm.org/en/scientific/mass/
Now it gets really silly
http://www.bipm.org/utils/en/pdf/Monographie1990-1-EN.pdf
You hold the mouse up to your mouth, and speak into it with clear audible tone: One Mississippi ... Two Mississippi... Three Mississippi...notjarvis wrote:QUOTE (notjarvis @ Nov 12 2010, 09:17 AM) This discussion reminds me of the discussion we had in physics class one day.
You contact a alien race by Hyper-radio
You have established a language you can bothe understand.
you want to describe all your frames of measurement to them.
How?
woah woah. A N/mm^2 is not the same as a kN/m^2!Raveen wrote:QUOTE (Raveen @ Nov 12 2010, 05:00 AM) Speaking as an engineer SI units are more convenient than most of the alternatives. However in every field there are conventions that change the usual units (so N/mm^2, kN/m^2/N/cm^2 all in different fields, and yes I know that the first two are equivalent). It's a bloomin' nuisance in all honesty. I also hat the fact that the standard base unit of mass is kg not g. If I were in charge of the metric system it'd have made a hell of a lot more sense than it does.
they are off by a factor of 1000
also, thread derailment accomplished.
JimmyNighthawk wrote:QUOTE (JimmyNighthawk @ Jun 30 2013, 11:32 PM) "Bavarian Sausage Anti-Ketchup Soap"[*]
