What does compression stress mean?

Compressive stress is a force that acts to reduce the length of an object in the direction of its application. It's the opposite of tensile stress, which acts to increase the length of an object.

Compressive stress is typically expressed in units of psi (pounds per square inch) or megapascals (MPa).

Examples:

1. When someone pushes their palms together with a lot of force, they're applying compressive stress to their palms and the air within.

2. A skyscraper experiences compressive stress due to the weight of the entire building pushing down on its foundational supports.

Compressive stress plays a critical role in many engineering contexts, as it helps determine an object's strength and stability under compression loads. Materials like rock, steel, and concrete display more significant resistance to compressive stresses compared to tensile stresses. That's why they're typically employed in scenarios where compression is a crucial performance metric.