Huber's equation, first derived by a Polish engineer Tytus Maksymilian Huber, is a basic formula in elastic material tension calculations, an equivalent of the equation of state, but applying to solids. In most simple expression and commonly in use it looks like this:
where σ is the tensile stress, and τ is the shear stress, measured in newtons per square meter (N/m², also called pascals, Pa), while σ_{red}  called a reduced tension, is the resultant tension of the material.
Very useful in calculating the span width of the bridges like Golden Gate Bridge or VerrazanoNarrows Bridge, their beam crosssections, etc.
