Which of the following describes one of the three descriptions of smoke movement?

The concept of smoke movement can be effectively described as "heat pushed," which refers to the behavior of smoke as it moves due to the thermal currents generated by heat sources. When a fire burns, it produces heat that causes the surrounding air to rise; this rising hot air can push smoke upwards and outwards, which is a critical factor in understanding smoke dynamics during firefighting operations.

Recognizing that heat plays a vital role in smoke movement allows firefighters and safety officers to predict where smoke might travel within a structure. This understanding is essential for making informed decisions during fire response, such as identifying areas that may be impacted by smoke and determining the safest route for evacuation or firefighting efforts.

The other descriptions, while they may relate to aspects of smoke behavior, do not encapsulate the primary physical mechanics driving smoke movement as accurately as "heat pushed" does. Concentrated, retained, and dispersed refer more to the characteristics of smoke itself rather than the mechanism of its movement caused by heat, making them less accurate in this context.