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[Jan Stránský <question691104@xxxxxxxxxxxxxxxxxxxxx>]

Question #691104 on Yade changed:
https://answers.launchpad.net/yade/+question/691104

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

TLTR: if you have to ask, do not change it
There is no real need and often a confusion is a by-product (or the main product)..
Also such code is more error prone (one easily forget to transform some input/output).
**I personally** strongly suggest to stay in basic SI unit system.


each quantity has a physical dimension, to transform it to another unit system, just substitute the transformation relation (1 m = 1000 mm). For the quantities mentioned:

density:
kg/m^3 = kg/(1000*mm)^3 = kg/(1000^3 * mm^3) = 1/(10^9) kg/mm^3

acceleration, gravity:
m/s^2 = (1000 mm)/s^2 = 1000 mm/s^2

Kn, Ks (assuming N/m, just "Kn" is too ambiguous):
N/m = (kg*m/s^2)/m = kg/s^2 (no change)

young:
Pa = N/m^2 = (kg*m/s^2)/m^2 = kg/(m*s^2) = kg/(1000*mm*s^2) = 1/1000 * kg/(mm*s^2)

poisson: no change (is dimensionless)

cheers
Jan

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