Question:

Bernoulli's principle?

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Why does smoke go up a chimney? and why does a car's top bulge upward in high speed? How do you relate it to bernoulli's principle?

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  1. Um... smoke goes up a chimney because it is hotter and thus less dense than the cooler surrounding air.

    If there is a horizontal movement of air across the top of the chimney, then Bermoulli's effect causes the smoke to move upwards more quickly, since the chimney restricts the air movement local to it, and causes the air to move faster over the top, and when air moves faster its pressure drops.

    In the same way, when a convertible car moves, the air movement from the front of the car and hood over the windshield causes the air just above the roof to move more quickly, and again Bernoulli's effect causes the roof to lift: that faster moving air has less pressure, so the normal-pressured air in the car is able to push the top against the lower pressured air above it.

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