Real Attributes of Physical Quantities

Database Management Reference Manual

Attributes : Real Attributes of Physical Quantities

Real attributes can be purely numeric, but often they may be representing physical quantities. The type of a physical quantity is its (physical) dimension.

Attributes of physical quantities are consistently stored in the database in defined database units, irrespective of the current working units, or of the units of any value entered by the user. The whole system operates on the expectation that all stored values of physically dimensioned quantities are in their relevant standard database units.

The following table lists the dimensions understood by the system giving:

Their name (or description) recognised by the system,

The assigned hashcode,

The database storage units.

Supported standard units for the quantity

For example attributes of length have a hash code of DIST are stored in mm and other standard units include inch, cm, ft, metre etc.


Name of Dimension	HashCode/Word	Database Units	Other Specific Units	Comments
AbsPressure	ABSP	pascal	bar atm PSI torr mmHg inHg	pressure may be absolute or gauge
Angle	ANGL	degree	radian grade arcmin arcsec
AngularMomentum	ANGM	N.m.s
Area	SQDI	mm2	acre hectare
Bore	BORE	mm	in	Range of bore units limited to mm and inch (and Finch)
Capacitance	CAPA	farad
Charge	CHAR	coulomb
Conductance	COND	siemens
Content	PCUD	mm-3
Currency	CURY	USDollar	UKPound Euro
Current	CURR	ampere
Density	DENS	kg/m3
DensityMANDB	MAND	kg/mm3		densities stored in MANU database
ElectricConductivity	CNDT	Si/m
ElectricField	EFLD	V/m2
EMF	EMF	volt
Energy	ENER	kiloWatthour	joule BTU cal
EnergyDensity	EDEN	kg/m3
Force	FORC	newton	poundal dyne kgF lbF
FoulingFactor	FFAC	m2.K/W
Frequency	FREQ	hertz	rpm
GaugePressure	GAGE	pascal	bar atm PSI torr mmHg inHg	pressure may be absolute or gauge
HeatCapacity	ENTR	J/m
HeatingValue	HVAL	J/m3
HeatTransferCoeff	HTRA	W/m2/K
Impedance	IMPE	ohm
Inductance	INDU	henry
Inertia	INER	kg/m2
KinematicViscosity	KVIS	m2/s
Length	DIST	millimetre	m in ft cm km mile yard micron thou angstrom
LinearDensity	PDIS	mm-1
MagFieldIntensity	MFIN	A/m
MagFluxDensity	MFXD	tesla
MagneticFlux	MGFX	weber
Mass	MASS	kilogram	gram tonne pound oz longTon shortTon cwt
MassFlow	MFLO	kg/s
Momentum	MOME	N.s
Permeability	PMBT	H/m
Permittivity	PMTT	F/m
Power	POWE	kiloWatt	hp watt
Pressure	PRES	pascal
RadiationDose	RDOS	sievert	radd rem gray
Radioactivity	RADY	bequerel	curie
Resistivity	REST	ohm/m
RotationalStiffness	STFR	N.m/rad
SpecHeatCapacity	SHCP	N/K
SpecificEnergy	SENG	J/kg
Speed	SPEE	m/s
Stiffness	STIF	N/m
SurfaceDensity	PSQD	mm-2
Temperature	TEMP	degCelsius	degF K degRankine
TemperatureGradient	TPDI	degC/mm
ThermalConductivity	TCON	W/m/K
ThermalResistance	TRES	K/W
Time	TIME	second	min hr day month week year
Torque	TORQ	N.m
UnitMass	UMAS	kg/mm
ViscosityDynamic	VISC	s/Pa
Volume	CUDI	mm3	litre ImpGallon USGallon
VolumetricFlow	VFLO	m3/s
None	NONE			numerical real attribute
WORD	WORD			used in assigning parameter dimensions etc.
Parameter	UNIPAR			used for parameter attributes