Experiment - Fluid Dynamics

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Studying fluid dynamics using a bottle of water with holes drilled in it.
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Fill the glass with water
Place the card on top
Turn the glass over, while holding onto the card and making sure the card always stays flat. Do this over the plastic tray
When the glass is upside down let go of the card…
1) What is stopping the water from coming out ?
2) Why pressure inside the Glass decrease? If the reason is expansion of air then How

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