Define stress. Write its s. i units and dimensions
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Stress is the force per unit area on a body that tends to cause it to change shape. ... In SI units, force is measured in newtons and area in square metres. This means stress is newtons per square meter, or N/m2. ... 1 pascal (symbol Pa) is equal to 1 N/m2.
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In continuum mechanics, stress is a physical quantity that expresses the internal forces that neighbouring particles of a continuous material exert on each other, while strain is the measure of the deformation of the material.
In SI base units: Pa = kg⋅m−1⋅s−2
SI unit: Pascal
Other units: lbf per square inch (lbf/in2) psi, bar
Common symbols: σ
Dimension: M L−1 T−2
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