Tech Info: Formulae and Equations

Great care must be exercised in the use of units as the application of incompatible units probably constitutes the major cause of errors in calculation. This section gives some conversion factors to facilitate the expression of units on a common correct base.

Use of the International Standard (SI) units has become mandatory in the R.S.A. in terms of the Measuring Units and National Measuring Standards Act No. 76 of 1973 from the 5th of July 1974 as noted in Government Gazette No. 4326. This system must, therefore, be adhered to on all drawings, specifications, enquiries, contracts and orders.

The SI units consist of:

a) Base units
b) Supplementary units
c) Derived units