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In titration experiment if we place a thumb over the burette and keep its knob open then the liquid inside it doesn`t flow out. Why?

In titration experiment if we place a thumb over the burette and keep its knob open then the liquid inside it doesn`t flow out. Why?

Grade:12

1 Answers

Gosula Madhukar
84 Points
7 years ago
  the liquid inside the burette requires an aid of external force to flow out of the burette which is normally provided by the atmospheric pressure when thumb is not placed over it.

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