Max Planck

Planck's work in thermodynamics led to the formulations of his quantum theory. To explain the colors of hot glowing matter, he proposed that energy is radiated in very minute and discrete quantized amounts or packets, rather than in a continuous unbroken wave. 

Planck called the packets of energy quanta and he was able to determine that the energy of each quantum is equal to the frequency of the radiation multiplied by a universal constant that he derived, now known as Planck's constant. This number, expressed in terms of erg-seconds, measures the energy of an individual quantum. An erg is the amount of energy needed to raise a milligram of mass by a distance of 1 centimeter. Planck's constant, expressed by the variable h in equations, is approximately 6.63 x 10(E-27) erg-second. Planck's constant has become one of the basic constants of physics. It is used to describe the behavior of particles and waves at the atomic scale.

We've picked yet another video for you to watch here:

Courtesy: Guillotined Chemistry