Module constants 

Physical constants as dimension-typed symbolic expressions. Physical constants as dimension-typed symbolic expressions.

Each constant displays as its standard symbol (e.g., “c” for speed of light) and evaluates to its exact value when numerical evaluation is requested. All values are exact — defined by the 2019 SI redefinition or by international agreement.

Examples

use symplex::prelude::*;
use symplex::units::*;
use symplex::units::constants;

let ctx = Context::new();
let c = constants::speed_of_light(&ctx);
let m = Mass::symbol(&ctx, "m");
let energy = Energy::from_ex(m.inner() * c.inner() * c.inner());  // E = mc²
// Displays symbolically, not as "89875517873681764*m"
assert_eq!(format!("{}", energy.inner()), "m*c^2");

Functions

avogadro_constant

Avogadro constant: N_A = 6.02214076 × 10²³ mol⁻¹ (exact since 2019 SI redefinition).

boltzmann_constant

Boltzmann constant: k_B = 1.380649 × 10⁻²³ J/K (exact since 2019 SI redefinition).

elementary_charge

Elementary charge: e = 1.602176634 × 10⁻¹⁹ C (exact since 2019 SI redefinition).

gravitational_constant

Newtonian gravitational constant: G ≈ 6.67430 × 10⁻¹¹ m³/(kg·s²).

physical_constants_dimmap

Pre-built dimension map containing all physical constants.

planck_constant

Planck constant: h = 6.62607015 × 10⁻³⁴ J·s (exact since 2019 SI redefinition).

reduced_planck_constant

Reduced Planck constant: ℏ = h/(2π) (exact).

speed_of_light

Speed of light in vacuum: c = 299,792,458 m/s (exact since 2019 SI redefinition).

standard_gravity

Standard acceleration of gravity: g₀ = 9.80665 m/s² (exact by definition, 1901).