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Namespaces
namespace	PhysicalConstants
	General physical constants of the Earth and universe.

namespace	Ice
	Properties of water ice around 0˚C and 101.3 kPa.

namespace	Air
	Properties of dry air around 0˚C and 101.3 kPa.

namespace	Vapour
	Properties of water vapour.

namespace	Water
	Properties of liquid water.

Functions
double	Nextsim::kelvin (double celsius)
	Convert a temperature from ˚C to K.

double	Nextsim::celsius (double kelvin)
	Convert a temperature from K to ˚C.

double	Nextsim::degrees (double radians)
	Convert an angle from radians to degrees.

double	Nextsim::radians (double degrees)
	Convert an angle from degrees to radians.

double	Nextsim::mbar (double pascals)
	Convert a pressure from Pa to mbar.

double	Nextsim::pascals (double mbar)
	Convert a pressure from mbar to Pa.

Variables
const double	PhysicalConstants::g = 9.8321849378

const double	PhysicalConstants::sigma = 5.670374419e-8
	Stefan-Boltzmann constant. [W m⁻² K⁻⁴].

const double	PhysicalConstants::vonKarman = 0.4
	Von Karman constant. [1].

const double	PhysicalConstants::omega = 7.2921158e-5
	Rotation rate of the Earth [rad s⁻¹].

const double	PhysicalConstants::Tt = 273.16
	Triple point temperature of pure water [K].

const double	PhysicalConstants::tau = 6.28318530717958647652
	Ratio of circumference to radius.

const double	Ice::cp = 2100.
	Specific heat capacity at constant pressure of water ice [J kg⁻¹ K⁻¹].

const double	Ice::epsilon = 0.996
	Thermal emissivity of smooth ice [0..1].

const double	Ice::kappa = 2.0334
	Heat conductivity of ice [W m⁻¹ K⁻¹].

const double	Ice::Lf = 333.55e3
	Latent heat of fusion of ice/water [J kg⁻¹].

const double	Ice::rho = 917

const double	Ice::rhoSnow = 330.

const double	Ice::s = 5
	Salinity of sea ice. [g kg⁻¹].

const double	Ice::Tm = 273.15
	Melting point of pure ice [K].

const double	Air::cp = 1004.64
	Specific heat capacity at constant pressure of dry air [J kg⁻¹ K⁻¹].

const double	Air::Ra = 287.058
	Specific gas constant for dry air [J kg⁻¹ K⁻¹].

const double	Air::rho = 1.2754
	Density of dry air at IUPAC STP [kg m⁻³].

const double	Vapour::cp = 1860.
	Specific heat capacity at constant pressure of water vapour [J kg⁻¹ K⁻¹].

const double	Vapour::Lv0 = 2500.79e3
	Latent heat of vaporization at 0˚C [J kg⁻¹].

const double	Vapour::Ra = 461.5
	Specific gas constant for water vapour [J kg⁻¹ K⁻¹].

const double	Water::cp = 4186.84
	Specific heat capacity at constant pressure of water [J kg⁻¹ K⁻¹].

const double	Water::Lf = Ice::Lf
	Latent heat of fusion of water/ice [J kg⁻¹].

const double	Water::Lv0 = Vapour::Lv0
	Latent heat of vaporization at 0˚C [J kg⁻¹].

const double	Water::mu = 0.055
	Proportionality constant between salinity in psu and freezing point depression [K psu⁻¹].

const double	Water::rho = 1000
	Density of fresh water at 4˚C. [kg m⁻³].

const double	Water::rhoOcean = 1025
	Typical density of ocean water. [kg m⁻³].

const double	Water::Tf = Ice::Tm
	Freezing point of pure water. [K].

const double	Water::TfOcean = -1.8
	Freezing point of typical ocean water. [˚C].