When a straw is used to drink a beverage, what fundamental principle related to air pressure allows the liquid to move upwards into the straw?

4 views 0 helpful Updated Jul 27, 2026
Appears in Class 8th
Solution ✔ Verified
  • ACapillary action pulling the liquid up.
  • BThe atmospheric pressure inside the straw increases.
  • CThe act of sucking reduces air pressure inside the straw, allowing external atmospheric pressure to push the liquid up.
  • DThe liquid's surface tension is overcome by the suction force.
Explanation

When a person sucks on a straw, they remove air from inside it, creating a region of lower air pressure. The greater atmospheric pressure acting on the surface of the liquid outside the straw then pushes the liquid up into the straw and into the mouth.

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