BASIC DIFFERENCE BETWEEN PRESSURE AND STRESS

DIFFERENCE BETWEEN PRESSURE AND STRESS PRESSURE * Pressure is defined as the normal force per unit area. *Pressure is applicable in case of ...

DIFFERENCE BETWEEN PRESSURE AND STRESS

PRESSURE

*Pressure is defined as the normal force per unit area.

*Pressure is applicable in case of liquid and gas.

*The nature of pressure is always compressive.

*Magnitude of pressure at a point in a static fluid is equal in all direction as per PASCAL'law.

*Pressure=force/area

pressure=density*acceleration due to gravity *height  (height is taken as the vertical distance from free surface)

*Pressure can be measured by using various devices such as pressure gauge and manometer etc

STRESS

*stress is defined as resisting force per cross-section area

Resisting force- When (tensile,compressive ,shear) force is applied on a deform able  body ,the body

exert resisting force against the applied force which resist the body to get deform.

*Stress is applicable in case of solid only

*Nature of stress can be tensile ,compressive and shear type.

Tensile stress- stress which leads to elongation in a  body.

compressive stress- stress which leads to compression in a body.

Shear stress- stress which leads to angular deformation in a body.

*Magnitude of stress at a point is different in different direction.

*stress=Resisting force/cross-section area

 stress=strain*Young's modulus of elasticity

*There is no device to measure stress , it is measured by calculating elongation.