Variables and Constants

Defining and using variables in Calcumber is straightforward and flexible — just assign and use:

banana = 0.70;

chocolate = 2.40;

5 * banana + 2 * chocolate → 8.3

Although Calcumber understands the cost of bananas and chocolate, it doesn’t know yet about the extra joy of eating them together🍌🍫.

Name	Description	Value
`_Q_e`	elementary charge	`1.602176634e-19 C`
`_G`	Newtonian constant of gravitation	`6.67430e-11 m^3/kg*s^2`
`_c`	speed of light in vacuum	`299792458 m/s`
`_eps0`	vacuum electric permittivity	`8.8541878128e-12 F/m`
`_mu0`	vacuum magnetic permeability	`1.25663706212e-6 N/A^2`
`_m_e`	electron mass	`9.1093837015e-31 kg`
`_m_p`	proton mass	`1.67262192369e-27 kg`
`_m_n`	neutron mass	`1.67492749804e-27 kg`
`_k`	Boltzmann constant	`1.380649e-23 J/K`
`_h`	Planck constant	`6.62607015e-34 J*s`
`_hbar`	reduced Planck constant (ħ)	`1.054571817e-34 J*s`
`_NA`	Avogadro constant	`6.02214076e23 1/mol`
`_R`	ideal gas constant	`8.314462618 J/mol*K`
`_sigma`	Stefan-Boltzmann constant	`5.670374419e-8 W/m^2*K^4`
`_alpha`	fine-structure constant (dimensionless)	`7.2973525693e-3`
`_g0`	standard gravity	`9.80665 m/s^2`
`_Ry`	Rydberg constant (energy form)	`2.1798723611035e-18 J`
`_b_wien`	Wien’s displacement constant	`2.897771955e-3 m*K`