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Question 1: Smoke rises in a chimney faster when a breeze is blowing. Use Bernoulli’s Principle to explain this phenomenon.


Bernoulli’s Principle is

Where P = pressure of the fluid
ρ = density of the fluid
v = velocity of the fluid.

So, when velocity of the fluid is increased, the pressure must decrease in order to keep the sum of the equation on LHS constant.
Now when air is blowing, the velocity of the air is increased over the top of the chimney. However, the pressure below (ground, kitchen etc) is larger. The difference in pressure on the top of the chimney and beneath, forces the air and smoke particles inside the chimney to rush upward toward the low pressure at the top of the chimney. Therefore, the smoke rises faster when breeze (air) is blowing.

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