What does the unit "pound per square foot" (psf) measure in load calculations?

The unit "pound per square foot" (psf) specifically measures pressure, which is the amount of force applied per unit area. In the context of load calculations, it indicates how much weight is distributed across a specific area, allowing engineers and architects to evaluate how structures respond to applied loads, such as furniture, occupants, and equipment.

When a load is applied to a surface, understanding the pressure in psf helps in designing floors, roofs, and other structural components to ensure they can safely support the intended loads without failing. This unit thus plays a crucial role in structural integrity assessments and the overall safety of building designs, as it provides a clear picture of how loads influence the behavior of materials when distributed over a defined area.