SimulationMade with three.js
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A 3D scene and a common logarithm ruler that take you from a proton (1.7 × 10⁻¹⁵ m) to the observable universe (8.8 × 10²⁶ m), changing the view width by factors of ten. Choose two objects to find how many times bigger one is from the gap on the scale (the difference of common logarithms), and find the common logarithm of a number like 3.8 × 10⁸ as a place within one step.
Key conceptscommon logarithm · powers of ten · exponent · properties of logarithms · orders of magnitude · scale · atoms and the universe