Final answer:
The top of a factory-built chimney has a storm collar to protect against rain, separate from Bernoulli's principle, which explains the T-shaped chimney pipe design that enhances draft by creating a pressure difference.
Step-by-step explanation:
The top of a factory-built chimney has a storm collar to divert rainwater from the chimney pipe to the chimney flashing. This is not directly related to Bernoulli's principle, which explains the behavior of gases in motion and is linked to the way some T-shaped chimney pipes are designed to enhance the draft.
Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.
For T-shaped chimney pipes, the crosspiece on top can cause a slight breeze to move faster across the top, creating lower pressure and due to the higher pressure inside, the gases are drawn up the chimney.
This is an application of Bernoulli's principle, where the variation in pressure helps move gases through the chimney more effectively.