KVUnits Namespace Reference

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

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/KVUnits::mbar) 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*KVUnits::atm) is pressure in torr;
• x = mass in microgrammes: (x*KVUnits::ug) 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);