<unit_magnitude>

It can contain the following fields: <unit>
The parameters are as follows,
n - Name used to reference the field, especially when writing the .dat file.
pn - Label that will be visualized by the user. It can be translated.
default - Default unit for a specific magnitude.
SI_base -Unit based in the international system units for a specific magnitude.
active - It is the default unit shown in the user interface, for a specific magnitude.

Defining magnitudes and units

The attributes involved in any field of the .spd file are 'unit_magnitude' and 'units'.

unit_magnitude: Its value relates to the name 'n' used to reference the unit field. Please see the table below for a complete list of all the names available.
units: Its value is the default unit shown in the GUI, which could be changed, if desired.

Some functions are useful for writing data with units defined into the calculation file. For more information about this issue, see the section called Writing the input file for calculation.

Example:

<value n="ini_temp" pn="Initial temperature" v="20.0" unit_magnitude="Temp" units="°C"/>

Note: For instance, it is convenient to change magnitudes like unit_magnitude="F/L^2" by unit_magnitude="P".

The table below gives a summary of the names used for all unit magnitudes available.

pn	n	Unit by default
Length	L	m
Mass	M	kg
Time	T	s
Temperature	Temp	K
Frequency	Frequency	Hz
Force	F	N
Pressure	P	Pa
Energy	Energy	J
Power	Power	W
Angle	Angle	rad
Solid_angle	Solid_angle	sr
Velocity	Velocity	m/s
Acceleration	Acceleration	m/s^2
Area	Area	m^2
Volume	Volume	m^3
Density	Density	kg/m^3
Electric current	Electric_current	A
Amount of substance	Amount_of_substance	mol
Luminous intensity	Luminous_intensity	cd
Electric charge	Electric_charge	C
Electric potential	Electric_potential	V
Capacitance	Capacitance	F
Electric resistance	Electric_resistance	?
Electric conductance	Electric_conductance	S
Magnetic flux	Magnetic_flux	Wb
Magnetic flux density	Magnetic_flux_density	T
Inductance	Inductance	H
Delta phi	DeltaPhi	Δφ
Delta temperature	DeltaTemp	ΔK
Luminous flux	Luminous_flux	lm
Illuminance	Illuminance	lx
KinematicViscosity	KinematicViscosity	m^2/s
Viscosity	Viscosity	Pa*s
Permeability	Permeability	m^2

The default magnitudes and conversion factors could be seen at the file scripts\customLib\customLib\units.xml

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