Pressure, according to the second law of thermodynamics, will always move from:

The correct choice reflects a fundamental principle of the second law of thermodynamics, which states that energy tends to disperse or spread out unless constrained. When it comes to pressure, this means that fluids (gases or liquids) will naturally flow from areas of high pressure to areas of low pressure. This movement occurs because systems tend to seek equilibrium, with pressure equalizing eventually across a space.

Understanding this concept is essential for many applications in building science, particularly in heating, ventilation, and air conditioning (HVAC) systems, where the flow of air is driven by pressure differences. Recognizing how pressure gradients impact airflow can enhance efficiency and comfort within a building. This principle also underpins broader thermodynamic concepts, where heat transfer and other physical processes are similarly directed towards balance and stability.