Overall heat transfer coefficient
Kelvin <-> Newton
Gaussian beam (Beam width or spot size)
Pressure in a Contact Area between two spheres
Area moments of inertia for a filled quarter circle with respect to a horizontal or vertical axis through the centroid
Pythagorean triangle ( "a" side)
Circle equation in polar system
Wavenumber
Acceleration of a particle in an electric field
Area of an Ellipse