Answer
Liquid and air move from an area of higher pressure to an area of lower pressure. When a liquid is sucked by a straw, the pressure inside the straw becomes lower than the pressure outside. Because of this, the liquid travels from the outside (higher pressure) to inside (lower pressure) of the straw. The pressure exerted by the atmosphere is equal to the pressure exerted on the straw.
Work Step by Step
Liquid and air move from an area of higher pressure to an area of lower pressure. When a liquid is sucked by a straw, the pressure inside the straw becomes lower than the pressure outside. Because of this, the liquid travels from the outside (higher pressure) to inside (lower pressure) of the straw. The pressure exerted by the atmosphere is equal to the pressure exerted on the straw.
