Hubble's Law
Shannonâ€“Hartley theorem
Area of a Disc (integral)
Irrotational vortices (velocity)
Drainage Hooghoudt's equation
Rydberg formula for any hydrogen-like element
Volumetric water content
Thermal de Broglie wavelength (Massive Particles)
NTU method - NTU number
Hydraulic conductivity (Constant-head method)