Standard units of length, mass, volume, and pressure, and their conversion factors. More...

Variables
const long double	atm = 760.l

const long double	cc = 1.0l
	volumes More...

const long double	cl = 10.l * cc

const long double	cm = 1.0l

const long double	eV = 1.e-6l

const long double	fm = 1.e-13l

const long double	fmpc = 1.0l
	times More...

const long double	g = 1.0l
	masses More...

const long double	GK = 8.617331e-02

const long double	gpcm3 = 6.022141e-16

const long double	Joule = 6.241509e+12l

const long double	keV = 1.e-3l

const long double	kg = 1.e+3l

const long double	litre = 1.e+3l

const long double	m = 1.e+2l

const long double	mbar = 100.l * Pa

const long double	MeV = 1.0l
	energies More...

const long double	MeVpc2 = 1.782662e-27l

const long double	MeVpkb = 1.0l
	temperatures More...

const long double	mg = 1.e-3l

const long double	ml = cc

const long double	mm = 1.e-1l

const long double	nucpfm3 = 1.0l
	densities More...

const long double	Pa = atm / 101325.l

const long double	s = 2.997925e+23l

const long double	torr = 1.0l
	pressures More...

const long double	ug = 1.e-6l

const long double	um = 1.e-4l

Detailed Description

Standard units of length, mass, volume, and pressure, and their conversion factors.

This is a set of numerical constants used to define and convert units of length, mass, and pressure. The standard unit defined for each quantity is as follows:

standard mass unit : grammes(KVUnits::g)
standard length unit : centimetres (KVUnits::cm)
standard pressure unit : torr (KVUnits::torr)
standard mass unit : grammes (KVUnits::gr)
standard volume unit : cc/ml (KVUnits::cc)
standard energy unit : MeV (KVUnits::MeV)
standard time unit : fm/c (KVUnits::fmpc)
standard density unit : nuc/fm3 (KVUnits::nucpfm3)
standard temperature unit : MeV/kb (KVUnits::MeVpkb)

The value of the corresponding numerical constant for each of the standard units is 1. The other available units are:

mass units: microgramme (KVUnits::ug), milligramme (KVUnits::mg), kilogramme (KVUnits::kg)
length units: micron/micrometre (KVUnits::um), millimetre (KVUnits::mm), metre (KVUnits::m)
pressure units: millibar (KVUnits::mbar), pascal (KVUnits::Pa), atmosphere (KVUnits::atm)

Unit conversion

If x is a quantity expressed in terms of one of the standard units, the corresponding quantity in terms of a different unit is obtained by dividing x by the appropriate numerical constant:

x = pressure in torr: (x/KVUnitsmbar) is pressure in millibar;
x = mass in grammes: (x/KVUnitsmg) is mass in milligrammes;
x = length in centimetres: (x/KVUnitsum) is length in microns/micrometres.

On the other hand, if x is a quantity expressed in arbitrary units, then in order to express it in terms of standard units multiply x by the appropriate numerical constant:

x = pressure in atmospheres: (x*KVUnitsatm) is pressure in torr;
x = mass in microgrammes: (x*KVUnitsug) is mass in grammes;
x = length in millimetres: (x*KVUnitsmm) is length in centimetres.

Composite units

Similar conversions can be achieved by combinations of numerical constants. For example, if x is a density expressed in kilogrammes per cubic metre, the corresponding density in standard units ( \(g/cm^3\)) is

x*KVUnits::kg/pow(KVUnits::m, 3);

ROOT::VecOps::pow

RVec< PromoteTypes< T0, T1 > > pow(const T0 &x, const RVec< T1 > &v)

x

Double_t x[n]

KVUnits::kg

const long double kg

Definition: KVUnits.h:73

KVUnits::m

const long double m

Definition: KVUnits.h:70