An easy and quick to use unit converter.
Units are placed in logical groups.
Mechanics - length, surface area, volume, mass, power, planar angle, cone angle, time
Thermodynamics - density, work, pressure, performance, flow rate, temperature, amount of substance
Liquids - kinematic viscosity, dynamic viscosity
Electrics - electric current, electrical resistance, voltage
Optics - luminous intensity, brightness, lightning
Magnetism - magnetic induction, magnetic field strength, magnetic flux
Computer units - graphics, transfer rates, data size, number system
Others - radioactivity, speed, sound, frequency