# TRANSPOSITION OF FORMULAE : part 1

**Introduction**

**Most of the Mathematics of Engineering/Science consists of relationships between various physical quantities. These are expressed as Mathematical equations.**

**Examples**

- Area of a circle, radius
*r* - Coulombs Law. The force of attraction between two charged particles is
- Rate of heat transfer Q through a slab of heat conducting material, thickness
*l*is

**The Only Rule**

**There is only one rule for changing the appearance of an equation.**
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