Question

Difference between stress and pressure. Mention any two points​

Answer 1

✔Pressure is often used with fluids (gases or liquids), whereas stress is more often used with solids. ✔One major difference is that pressure only acts perpendicular to a surface, whereas stress can also be parallel to a surface as well as perpendicular to it. ... ✔A negative normal stress is called tension.

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Answer 2

Comparison between Pressure and Stress in Physics:

Pressure

Stress

Definition according to Wikipedia

Pressure is the ratio of force to the area over which that force is distributed.

Stress is a physical quantity that expresses the internal forces that neighboring particles of a continuous material exert on each other.

Definition

Pressure is the external force acting over a surface area of a material.

Stress is an internal force acting over a cross sectional area within the material.

Symbol

P or p

P or p

SI unit

Pascal (Pa)

Pascal (Pa)

Formula

P = F / A

P = F / A