Question

Stress and pressure are both forces per unit area. Then in what respect does stress differ from pressure?

Answer 1

Hint: The SI unit of stress and pressure is Pascal \[({\text{Pa}})\]. Pressure is the outward amount of force, while tension is the inner state force that actually occurs per unit area of the body from inside a stressed body.

Complete step by step solution:
Pressure: Pressure (symbol: \[{\text{p}}\] or\[{\text{P}}\]) is the force perpendicular to the object's surface, over which the force is spread. Gage pressure is the pressure relative to the ambient pressure, which is also spelled gauge pressure. Different pressurized units are used. The pressure unit SI (\[{\text{Pa}}\]), for instance, is one Newton per square meter (\[N/{m^2}\]). Similarly, the force pound per square inch (\[{\text{psi}}\]) is the traditional pressure unit in the imperial and the US customary systems. The force pound is the traditional unit of pressure in the imperial system.

Stress: When an object is applied with its deforming force. It deforms the object. The object will be generated in the object by an opposite force to restore its original form and size. This recovery force is equal in magnitude and contrary to the deformation force applied. The measurement of this restorative force is called stress per unit area. Measured with Pascal or \[N/{m^2}\], respectively. As – expressed mathematically
\[\sigma = \dfrac{F}{A}\]

Pressure is the external force per area of the unit, and stress is the internal force from inside the strain body that operates transversely by unit.

Note: Stress can be defined as the resistive internal force to deformation per unit area. Pressure may be defined as the amount of force applied per area per unit. The pressure isn't going to develop due to stress. Stress will develop as a result of the pressure.