UNITS

UNITS

All equations in this b o o k are expressed in terms of rationalised m.k.s. units. Numerical values are quoted in SI units and, in accord with recommended practice, are expressed in general in terms of 10 multiples or 1 0 " submultiples of the basic SI units. T o assist comparison with some of the c o m m o n quantities which have been discarded, it may be noted that 3

3

1 n m = 10 A 1 W b / m (i.e. 1 T) = 10 G 2

4

1 bar (i.e. 10 N / m ) = 1-0197 kgf/cm 5

2

2

However, there are certain quantities which have well-established units and which would be unfamiliar if quoted in terms of the metre. Exceptions have therefore been made of the following Carrier concentrations are quoted in units of c m " Absorption coefficients K are in units of c m Wavenumbers are in units of c m " Detectivities D* of photodetectors are in units of cm W 3

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