What natural process exerts the pressure of 1 Pascal?

Question

Ballpark.
House fly landing on a desk?
Raindrop falling on a roof?
Snowflake falling to the ground?

Answer 1

Take a sheet of paper and lay it flat on a table. The pressure is about 1 Pa. Ideally you want paper of "100 gsm" (or grams per square metre). 'Ordinary' photocopy paper is usually 80 gsm.