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Right, just an illustration. Water is the propelllant that forces to bottle rocket upwards. Imagine a hosepipe. If you hold it in your hand the water trickles out slowly. If you put your finger over the end, a fast an strong spary comes out. This is the result of water pressure. Likewise, if the bottom of the bottle were the same diameter as the rest of the bottle, there would be little pressure, and the water would just fall out. The bottleneck of a bottle acts as a funnel, which increases the pressure and cause water to come out faster and last a little longer. This crests a concentrated upward force which propels the bottle upwards.

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15y ago

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