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Quantity	Level Cat.	Use Id.	Name	Convesion factors to SI units (1 unit equals)	Represen. Symbol	Cross ref.
Periodic and related phenomena
frequency	1		hertz		Hz	114
	1S		kilohertz		kHz	115
	1S		megahertz		MHz	116
	1S		terahertz		THz	117
	1S		gigahertz		GHz	118
rotational frequency	1		reciprocal second		s-¹	119
	1		revolutions per second		r/s	120
	1		revolutions per minute		r/min	121
	1S		reciprocal minute		min-¹	122
angular frequency,	1		radian per second		rad/s	123
pulsatance	1		reciprocal second		s-¹	124
	1
wavelength	1		metre		m	125
	1		ångström		Å	126
wave number, attenuation coefficient, phase coefficient, propogation coefficient, repetency	1			reciprocal metre	m-¹	127
level of a field quantity,	1		neper		Np	128
level of a power quantity	1		decibel	0,115 129 3 Np	dB	129
damping coefficient	1		reciprocal second		s-¹	130
	1		neper per second		Np/s	131
logarithmic decrement	1		neper		Np	132

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