Temporal exponentials

{| class="wikitable" align=right ! Half-liveselapsed !! Fractionremaining !! colspan=2| Percentageremaining |- | 0 || ||align=right style="border-right-width: 0; padding-right:0"| 100||style="border-left-width: 0"| |- | 1 || ||align=right style="border-right-width: 0; padding-right:0"| 50||style="border-left-width: 0"| |- | 2 || ||align=right style="border-right-width: 0; padding-right:0"| 25||style="border-left-width: 0"| |- | 3 || ||align=right style="padding-right:0; border-right-width: 0"| 12||style="border-left-width: 0; padding-left:0"|.5 |- | 4 || ||align=right style="border-right-width

growth of quantities at rate proportional to the current amount

pharmacokinetic parameter; (of a substance) time it takes for a substance to lose half of its pharmacologic, physiologic, or radiologic activity

time required to double a quantity

Observation on semiconductor fab prices