Equation 5 · Part 1 · Einstein's Random Walk and the Mathematics of Genetic Drift
Symbol P
What this part means
the radius.
Its job in the formula
P is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol P→Article meaning
Where the article explains it
Einstein derived it explicitly, from the balance between the drag on a sphere of radius P in a fluid of viscosity k and the osmotic pressure driving diffusion, as
The passage around this formula
with the diffusion constant D fixed by measurable quantities. Einstein derived it explicitly, from the balance between the drag on a sphere of radius P in a fluid of viscosity k and the osmotic pressure driving diffusion, as
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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Sources cited in the article section
- [1] On the Motion of Small Particles Suspended in Liquids at Rest Required by the Molecular-Kinetic Theory of Heat ↗
- [2] Jean Baptiste Perrin ↗
These citations provide research context; check each source for the exact claim it supports.