Number size distribution
= Number size distribution
{title2=$n(D)=dN/d\ln D$}
A particle count per stated volume and logarithmic size interval. Its <integral> over $d\ln D$ gives a <number density>, unlike an <aerosol> mass distribution. In a <cloud-droplet activation> estimate, integrating the dry-size distribution above the size-dependent <Köhler theory> threshold gives activated number for a specified peak <atmospheric supersaturation> and composition.