What units are used to express pressure measurements

The three units used to express pressure are pascal (Pa), atmosphere (atm), and Hg (torr).

The three units are pascal(pa) atmosphere (atm) and hg (torr)

when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.