Variables and Constants
To assign a value to a variable use the = symbol or choose the variable to assign to with the x button in advanced mode. A variable name must only contain upper or lower case characters, or underscores.
x=5
example=82
Variables and constants can be used in any equation and are substituted for their assigned value. Variables and constants can be inserted using the x button.
6x+3
xy−3x+7y−21
The following variables are always defined.
_ |
Result of previous calculation |
rand |
Random value in the range [0,1] (changes on each read) |
The following constants are always defined.
Mathematics | |
e |
|
π |
|
τ |
|
φ |
Golden Ratio |
Electromagnetism | |
c₀ |
Light Speed |
е |
Elementary Charge |
Z₀ |
Impedance of Vacuum |
μ₀ |
Permeability of Vacuum |
ε₀ |
Permittivity of Vacuum |
Atomic & Nuclear | |
h |
Planck‘s Constant |
α |
Fine-Structure Constant |
mₑ |
Electron Mass |
mₚ |
Proton Mass |
Thermodynamics | |
k |
Boltzmann Constant |
mᵤ |
Atomic Mass Unit |
R |
Molar Gas Constant |
σ |
Stefan-Boltzmann Constant |
Nᴀ |
Avogadro‘s Number |
Gravitation | |
G |
Gravitational Constant |
g |
Earth Acceleration |