# 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

příklad=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

Následující proměnné jsou definovány vždy.

_ | Výsledek předchozího výpočtu
rand | Náhodná hodnota v rozsahu [0,1] (změní se pokaždé, když je čtena)

The following constants are always defined.

Mathematics
e | Eulerovo číslo
π | Ludolfovo číslo pí
τ | Tau
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