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The **Planck constant** (**h**) is
6.626068 × 10^{-34} m^{2} kg/s.
The relation of a photon's energy (E) to frequency (F)
is:

E = h × f

The **reduced Planck constant** (aka **Dirac constant**,
abbreviated **ℏ**) is h/2π,
which is convenient because many equations
incorporate this expression.
A set of units based upon the Planck constant and other
fundamental units (**Planck units**) are fully based upon
physical constants, i.e., a type of **natural units**. *Planck units*
reflect some minimal scales regarding the regime of current physical
laws: **Planck length**, **Planck mass**, and **Planck time**. For
example, a black hole of the Planck mass (a Planck hole) is
considered as small as they can be.

t_{P}≡ √(ℏG/c^{5}) m_{P}≡ √(ℏc/G) l_{P}≡ √(ℏG/c^{3})

- t
_{P}- Planck time (5.39 × 10^{-44}s). - m
_{P}- Planck mass (2.18 × 10^{-5}g). - l
_{P}- Planck length (1.62 × 10^{-35}cm). - G - gravitational constant.
- c - speed of light in a vacuum.

http://en.wikipedia.org/wiki/Planck_constant

http://en.wikipedia.org/wiki/Planck_units

black-body radiation

Bohr model

carbon monoxide (CO)

Compton wavelength

de Broglie wavelength

frequency

kelvin (K)

mass

photon energy

Planck function

Saha equation

Stefan-Boltzmann constant (σ)

Heisenberg uncertainty principle

Wien approximation

Wien's displacement law