Answer:
The more there is the less you see.
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
Late afternoons I often bathe. I'll soak in water piping hot. My essence goes through. My see through clothes. Used up am I - I've gone to pot.
In prison I'll be found. But I would never go to court Unless there's more than one
I run up and down the stairs without moving
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?