Final answer:
The difference in temperature inside a chimney compared to outside is known as stack temperature, which is crucial for creating a draft. T-shaped chimneys leverage Bernoulli's principle to improve this draft by reducing pressure as wind flows over the crosspiece.
Step-by-step explanation:
The difference in temperature of a column of gas inside the chimney from a column of air outside the chimney is known as B. stack temperature. This temperature difference creates a pressure differential that causes air to flow and is essential for chimney function.
When referring to chimney pipes with a T-shape, the crosspiece on top can enhance the draft in the chimney through the principles explained by Bernoulli's principle. As wind passes over the crosspiece, it speeds up and, according to Bernoulli's principle, causes a reduction in pressure. This reduction in pressure effectively helps to draw gases up from the chimney, improving the ventilation and the efficiency of the chimney's draft system.