### Planck Constant

**(h, Planck's Constant)**
(quantum of action in quantum mechanics)

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

E = h × f

(E being energy, f being Frequency).

The **Reduced Planck Constant** (or **Dirac Constant**,
abbreviated **ℏ**) is h/2π,
which is convenient because many equations
incorporate this expression.

A set of units based upon fundamental constants, including the
Planck constant determine some minimal scales regarding
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^{-33} cm).
- G - Gravitational Constant.
- c - speed of light.

(*physics,constant,quantum mechanics*)
http://en.wikipedia.org/wiki/Planck_constant

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

**Referenced by:**

Black-Body Radiation

Bohr Model

Carbon Monoxide (CO)

Frequency

Planck Function

Saha Equation

Stefan-Boltzmann Constant (σ)

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