# What are Growth/Decay rates?

Jul 28, 2017

Exponential formula (1st order kinetics)

#### Explanation:

If a substance is decaying under exponential circumstance

$C = {C}_{0} \times {e}^{- k \times t}$

is the formula to find the amount after t time. In this formula, k is decay rate.

If a substance is growing based on exponential circumstance

$C = {C}_{0} \times {e}^{k \times t}$

is the formula to find its amount after t time. In this formula, k is growth rate. Human population (if there is no upper limiting factor) grows like this.