In terms of draft, what role does temperature play?

In the context of draft in chimneys and fireplaces, temperature plays a critical role in the movement of gases. Hotter gases are indeed lighter compared to cooler gases. This lighter nature allows the hot gases to rise more easily and exit more forcefully through the flue or chimney. The principle behind this is based on the fact that as the temperature of a gas increases, its density decreases, causing it to rise due to buoyancy.

When the hot combustion gases ascend, they create a negative pressure within the combustion chamber or firebox, which in turn helps draw in air for combustion. This helps maintain a steady and efficient burning process, resulting in a proper draft.

Understanding the relationship between temperature and draft is essential for ensuring effective ventilation in heating appliances. The control of draft through managing temperatures can enhance the performance and safety of fireplaces and stoves. The correct understanding of this principle informs the design and operation of various types of fuel-burning appliances, ensuring they function efficiently and effectively.