When the piston of a pump is pulled up, the pressure inside_____
Fill in the blanks.
(a) The unit of pressure is ………… .
(b) Ink rises into the ink dropper because of the ………… pressure acting on the surface of the ink in the bottle.
(c) When the piston of a pump is pulled up, the pressure inside ………… .
(d) The air pressure inside our body is equal to the ………… .
Why does the liquid rise in a syringe when its piston is pulled up?