Answer Posted / mahesh verma

Strength is an extrinsic property of the material. It is
derived outcome of heat treatment processes. It is a
function of grain size, No of slip planes within a grain
etc. Therefore strength defines capacity of a material to
carry loads.
Stress is an internal resistance/force per unit area in the
material, generated due to application of external force.
Incidently, both have same units as strength is also
measured by force/area.

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