What is co-efficient of drying?

The coefficient of drying is a number about the utility of a dryer.

A simple example :

You have dirty clothes dry, and you wash them.

So now, you have a totally of 4kg wet clothes and you put them on the dryer.

The coefficient of drying K come from this formula :

K = Weight of wet clothes / Weight of dry clothes

So it depends from the speed of your dryer!