How to take the egg out of the flask?

Keep the flask upside down so that the narrow part of the egg just cover the mouth of the flask.
Blow air through the mouth of the flask so that air enters into the flask . Now the air pressure inside the flask is greater than that of the outside pressure. Due to this difference in pressure the air inside the flask exerts a force on the egg. Thus egg comes out of the flask. Enjoy the effect of air pressure.

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