.FCSys.Quantities

Information

In FCSys, the unit attribute of each Real variable actually denotes the dimension.1 The fundamental dimensions are angle (A), length (L), mass (M), particle number (N), and time (T). These are combined according to the rules established for unit strings [Modelica2010, p. 210]. Temperature and charge are derived dimensions (see the Units package).

The quantity attribute is not used since the type is the quantity. The displayUnit attribute is only used for quantities that imply a certain display unit.

Methods for unit checking have been established [Mattsson2008, Broman2008, Aronsson2009] and can, in theory, be applied to dimension checking instead.

The Quantities package is abbreviated as Q throughout the rest of FCSys.

The quantities are generally named with adjectives following the noun so that the quantities are grouped when alphabetized. Some quantities are aliases to other quantities but with special implied display units. For example, Temperature is an alias for Potential with a default display unit of K.ootnote{Temperature is a potential in the chosen system of units; see the next section ( ef{sec:Units}).} Also, some quantities have minimum values (e.g., zero for PressureAbsolute). For more information, please see the documentation of the Units package.

1. This misnomer is necessary because Real variables do not have a dimension attribute.

Licensed by the Hawaii Natural Energy Institute under the Modelica License 2
Copyright © 2007–2014, Hawaii Natural Energy Institute and Georgia Tech Research Corporation.

This Modelica package is free software and the use is completely at your own risk; it can be redistributed and/or modified under the terms of the Modelica License 2. For license conditions (including the disclaimer of warranty) see FCSys.UsersGuide.License or visit http://www.modelica.org/licenses/ModelicaLicense2.

Contents

Name Description
Examples Examples
Acceleration
Amount
AmountReciprocal Reciprocal of amount
Angle
Angle2 Solid angle
Area
AreaSpecific Specific area
Capacitance
Density
DensityRate Rate of density
ConductanceElectrical Electrical conductance
ConductivityElectrical Electrical conductivity
Continuity
Current
CurrentAreic Areic current
CurrentAreicAbsolute Absolute areic current
CurrentRate Rate of current
Diffusivity
Energy
Fluidity
Force
ForceSpecific Specific force
Frequency
Inductance
Length
LengthReciprocal Reciprocal of length
LengthSpecific Specific length
MagneticFlux Magnetic flux
MagneticFluxAreic Areic magnetic flux
MagneticFluxReciprocal Reciprocal of magnetic flux
Mass
MassSpecific Specific mass
MassVolumic Volumic mass
Mobility
MomentumRotational Rotational momentum
Number
NumberAbsolute Absolute number
Permeability
Permittivity
PermittivityReciprocal Reciprocal of permittivity
Potential
PotentialAbsolute Absolute potential
PotentialPerWavenumber Potential per wavenumber
PotentialRate Rate of potential
Power
PowerArea Power times area
PowerAreic Areic power
PowerAreicPerPotential4 Areic power per 4th power of potential
PowerRadiant Radiant power
Pressure
PressureAbsolute Absolute pressure
PressureRate Rate of pressure
PressureReciprocal Reciprocal of pressure
ResistanceElectrical Electrical resistance
ResistanceThermal Thermal resistance
SurfaceTension Surface tension
Resistivity
Time
TimeAbsolute Absolute time
TimeLineic Lineic time
Velocity
Velocity2 Squared velocity
VelocityAmount
Volume
VolumeRate Rate of volume
VolumeSpecific Specific volume
VolumeSpecificAbsolute Absolute specific volume
VolumeSpecificRate Rate of specific volume
Wavenumber
CapacityThermal Thermal capacity
CapacityThermalSpecific Specific thermal capacity
CapacityThermalVolumic Volumic thermal capacity
PotentialChemical Chemical potential
Temperature
TemperatureAbsolute Absolute temperature
TemperatureRate Rate of temperature
ResistivityThermal Thermal resistivity
Conductance Conductance

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