What Does Planck’s Constant Mean?

Planck’s Constant relates the energy of one photon (the smallest possible energy ‘packet’) of electromagnetic waves to the frequency of that wave, and is denoted by h. The energy and frequency in the case of photon energy are directly proportional to each other, and hence Planck’s constant is the constant of proportionality between them.

Techopedia Explains Planck’s Constant

The SI (International System) unit for Planck’s constant is approximately equal to 6.626176 x 10-34 joule-seconds, whereas in the small-unit metric or centimeter-gram-second (cgs) system it is thought to be approximately equal to 6.626176 x 10-27 erg-seconds.