Pre-defined Constants

The simulator provides natural and mathematical constants that can be used in mathematical expressions within component dialog boxes or SML descriptions.

The following table shows the available constants and their corresponding symbols:

Constant	Legacy Name¹	Value	Unit	Description	Symbol
abs0	PHYS_T0	-273.15	°C	Absolute Zero	J
boltz	PHYS_K	1.38066 10^-23	J/K	Boltzmann constant	k_B
c0	PHYS_C	299792458	m/s	Speed of light	c
e0	PHYS_E	8.85419 10^-12	C²•Jm	Permittivity of vacuum	e₀
elecq	PHYS_Q	1.60217733 10^-19	C	Elementary charge	e
eta	N/A	376.730313461	Ohm	Impedance of vacuum	h
false		0		Boolean False
g0	PHYS_G	9.80665	m/s²	Acceleration due to gravity	g
mathE	MATH_E	2.718281828	[/]	Euler number	E
pi	MATH_PI	3.1415926535898	[/]	Pi	p
planck	PHYS_H	6.6260755 10^-34	Js	Planck constant	h
true		1		Boolean True
u0	PHYS_MU0	1.25664 10^-06	T²m³/J	Permeability of vacuum	m₀

For backward compatibility, #defines of these names will be replaced by their values during translation of a model definition - unless the #define line is still present in the model definition.