A person tries to use a plunger to clear a clogged drain. For the plunger to work effectively, what pressure condition must be created under the plunger, and how does this clear the clog?

6 views 0 helpful Updated Jul 27, 2026
Appears in Class 8th
Solution ✔ Verified
Answer

For a plunger to work effectively, it must create a low-pressure area (partial vacuum) directly over the drain opening when pushed down and quickly pulled up. When the plunger is pulled up, the lower pressure under it allows the significantly higher atmospheric pressure in the room to push down on the water in the drain. This differential pressure, combined with the suction created, helps to dislodge and clear the clog.

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