How atmospheric pressure hel in drinking straw

Atmospheric pressure helps a drinking straw work because it pushes down on the liquid in the cup. When you suck on the straw, you reduce the air pressure inside it. This pressure difference causes the higher atmospheric pressure outside the straw to push the liquid up into the straw and into your mouth.

Here's a breakdown:

• Step 1: The atmosphere exerts pressure on all surfaces, including the liquid in your drink.
• Step 2: When you create a partial vacuum by sucking on the straw, the pressure inside the straw becomes lower than the atmospheric pressure outside.
• Step 3: The greater atmospheric pressure outside then forces the liquid up the straw to equalize the pressure.