to spread or diffuse throughout (something)
He was fundamentally and outwardly abject … it was the element of his nature which permeated all his acts and passions and emotions — Joseph Conrad
to pass through the pores, gaps, cracks, etc of (something)
permeation /-ʹaysh(ə)n/ noun
[Latin permeatus, past part. of permeare, from per- + meare to go, pass]