with the end of the delivery tube still submerged in the breaker of water and the cup of the bottle still closed the water trough is carefully emptied and filled with ice cold water predict what will be observed
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Explanation:
The water does not enter the bottle because of the presence of air inside it. When the bottle is dipped inside water, it applies pressure on the air present inside so as to replace it. But the air present inside the bottle applies opposite force on the water as it tries to escape through the only opening present which is surrounded by water. So both the forces cancel each other and maintain an equilibrium due to which the neither the air gets out nor the water gets in.