# What is Planck's constant?

Mar 16, 2018

Planck's constant is $h \approx 6.63 \cdot {10}^{-} 34 \setminus \text{J"*"s}$.

#### Explanation:

Planck's constant, in science, is denoted by $h$, and is given the value of

$h \approx 6.63 \cdot {10}^{-} 34 \setminus \text{J"*"s}$

Note that $1 \setminus \text{J"=1 \ "N"*"m}$

$= 1 \setminus \text{kg"*"m/s"^2*"m}$

$= 1 \setminus {\text{kg"*"m"^2"/s}}^{2}$

And so, we can rewrite $h$ as

$h \approx 6.63 \cdot {10}^{-} 34 \setminus \text{kg"*"m"^2"/s"^2*"s}$

$= 6.63 \cdot {10}^{-} 34 \setminus {\text{kg"*"m"^2*"s}}^{-} 1$

This is one of the smallest constants in physics, and gives the relationship between a photon's energy and its frequency.