Lighting Technology, 2nd Edition

Appendix V

Formulae and conversion tables

 

Most scientific measurements are made using the International System of Units (Systeme International d'Units) or SI for short.

The three basic units are the metre, kilogram and the second. From these are derived the whole range of units which cover the world of physics. For the ease of our readers we have picked out only those units which are applicable to the subject matter in this book.

Measurement of length

Basic unit:	metre (m)
Other units:
centimetre (cm)	= one hundredth of a metre (10−2 m)
millimetre (mm)	= one thousandth of a metre (10−3 m)
nanometre (nm)	= one thousandth millionth of a metre (10−9 m)

Measurement of area

Basic unit:	square metre (m2)
Other units:
square ...