LN2: natural logarithm of two

LN2 is ln(2), approximately 0.693147. It appears in half-life, information, and exponential-growth formulas.

Typical use

A half-life relation often uses LN2 divided by a decay constant. Pair it with log(), exp(), and division when rearranging exponential models.

Caveat

Use consistent time units in decay calculations and avoid rounding LN2 early.