/// Classical mechanics physical constants module
/// Provides commonly used physical constants in classical mechanics calculations

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/// Fundamental physical constants
/// Speed of light (m/s)
pub let speed_of_light : Double = 299792458.0

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/// Gravitational constant G (m³/(kg·s²))
pub let gravitational_constant : Double = 6.67430e-11

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/// Planck constant h (J·s)
pub let planck_constant : Double = 6.62607015e-34

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/// Reduced Planck constant ħ = h/(2π) (J·s)
pub let reduced_planck_constant : Double = 1.054571817e-34

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/// Earth-related constants
/// Earth surface gravitational acceleration g (m/s²)
pub let earth_gravity : Double = 9.80665

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/// Earth mean radius (m)
pub let earth_radius : Double = 6371000.0

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/// Earth mass (kg)
pub let earth_mass : Double = 5.9722e24

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/// Earth mean angular velocity (rad/s)
pub let earth_angular_velocity : Double = 7.292115e-5

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/// Sun mass (kg)
pub let sun_mass : Double = 1.9891e30

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/// Moon mass (kg)
pub let moon_mass : Double = 7.342e22

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/// Common alias - gravitational acceleration
pub let g : Double = earth_gravity

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/// Common alias - gravitational constant
pub const G : Double = 6.67430e-11

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/// Common alias - speed of light
pub let c : Double = speed_of_light

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/// Mercury mass (kg)
pub let mercury_mass : Double = 3.3011e23

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/// Mercury radius (m)
pub let mercury_radius : Double = 2439700.0

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/// Mercury surface gravity (m/s²)
pub let mercury_gravity : Double = 3.7

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/// Venus mass (kg)
pub let venus_mass : Double = 4.8675e24

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/// Venus radius (m)
pub let venus_radius : Double = 6051800.0

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/// Venus surface gravity (m/s²)
pub let venus_gravity : Double = 8.87

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/// Mars mass (kg)
pub let mars_mass : Double = 6.4171e23

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/// Mars radius (m)
pub let mars_radius : Double = 3389500.0

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/// Mars surface gravity (m/s²)
pub let mars_gravity : Double = 3.711

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/// Jupiter mass (kg)
pub let jupiter_mass : Double = 1.8982e27

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/// Jupiter radius (m)
pub let jupiter_radius : Double = 69911000.0

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/// Jupiter surface gravity (m/s²)
pub let jupiter_gravity : Double = 24.79

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/// Saturn mass (kg)
pub let saturn_mass : Double = 5.6834e26

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/// Saturn radius (m)
pub let saturn_radius : Double = 58232000.0

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/// Saturn surface gravity (m/s²)
pub let saturn_gravity : Double = 10.44

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/// Density of water (kg/m³) at 4°C
pub let water_density : Double = 1000.0

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/// Density of air (kg/m³) at sea level, 20°C
pub let air_density_sea_level : Double = 1.204

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/// Dynamic viscosity of water (Pa·s) at 20°C
pub let water_viscosity : Double = 1.002e-3

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/// Dynamic viscosity of air (Pa·s) at 20°C
pub let air_viscosity : Double = 1.825e-5

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/// Surface tension of water (N/m) at 20°C
pub let water_surface_tension : Double = 0.0728

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/// Young's modulus of steel (Pa)
pub let steel_youngs_modulus : Double = 2.0e11

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/// Young's modulus of aluminum (Pa)
pub let aluminum_youngs_modulus : Double = 7.0e10

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/// Young's modulus of concrete (Pa)
pub let concrete_youngs_modulus : Double = 3.0e10

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/// Astronomical unit (m) - average Earth-Sun distance
pub let astronomical_unit : Double = 1.496e11

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/// Light year (m)
pub let light_year : Double = 9.461e15

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/// Parsec (m)
pub let parsec : Double = 3.086e16

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/// Earth-Sun distance (semi-major axis) (m)
pub let earth_sun_distance : Double = 1.496e11

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/// Moon-Earth distance (average) (m)
pub let moon_earth_distance : Double = 3.844e8

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/// Boltzmann constant (J/K)
pub let boltzmann_constant : Double = 1.380649e-23

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/// Avogadro's number (1/mol)
pub let avogadro_number : Double = 6.02214076e23

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/// Universal gas constant (J/(mol·K))
pub let gas_constant : Double = 8.314462618

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/// Standard atmospheric pressure (Pa)
pub let atmospheric_pressure : Double = 101325.0

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/// Standard temperature (K) - 0°C
pub let standard_temperature : Double = 273.15