Hi dear users,
I use sphere atom style and I want to make a data file to generate my initial coordinates, in manual there is a clumn that specifies the density of each particle that is (mass/distance^3 units), what is distance in this formula? is this diameter or dictance between atoms or something else?
best regard
Nich Nack
It is just telling you that the value is density which is mass/volume.
The distance (or volume units) are in whatever unit system
you are using, e.g. Angstroms^3. See the units command.
Steve
Dear plimpton,
thanks for your answer
is it the volume of the particle (4/3pir^3)?
Best regard
Nich
Dear plimpton,
thanks for your answer
is it the volume of the particle (4/3*pi*r^3)?
we usually don't play 20 questions here, so
rather than guessing, try logical thinking instead.
a density is a *density*.
density is by its very definition
independent of the volume of
its object.
please be a bit careful when reading/translating
words or expressions. distance units just means
the unit that you use to measure a distance.
axel.
For spherical particles, the input density in converted
to a mass by using the formula you listed.
Steve