*What is ‘thermal buoyancy’ and how can it be used in natural ventilation systems?

Thermal buoyancy ventilates a building by allowing denser, cold air to lift warmer air up and out of the building.
The amount or ‘power’ of thermal buoyancy depends upon:
1. The size of the temperature difference between the cold and warm air
2. The height differential between, where the cold air enters a space and where the warm air leaves (also known as the ‘chimney effect’)
Increasing the temperature and height differential increases the potential ventilation rate.