Aerosol
Particles of liquid or solid dispersed as a suspension in gas.


Electromagnetic Radiation
Energy propagated as time-varying electric and
magnetic fields. These two fields are inextricably linked as a single entity since time-varying electric fields produce time-varying magnetic fields and vice versa. Light and radar are examples of electromagnetic radiation differing only in their wavelengths (or frequency). Electric and magnetic
fields propagate through space at the speed of light.


Wavelength
Physical distance of one period (wave repeat).