Equation 4 · Part 1 · From Origins to Frontier: A History of Planetary Science and Exploration
Symbol eta
What this part means
eta is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Its job in the formula
eta 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 eta→Article meaning
The passage around this formula
…over geological time. The basic settling physics is captured by a Stokes-law sinking velocity for a dense blob of radius r and density moving through a less dense, viscous mantle of density and viscosity :
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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The article lists its research sources here.