Sir: Robin Clarke's version of the Second Law of Thermodynamics (Letters, 23 March) is 'off beam'. This law tells us that the rate of heat transfer (measured in watts) increases with increase of temperature difference. Efficiency of heat transfer does not necessarily increase with rising temperature difference.
Personally, I prefer the layman's versions of the Laws of Thermodynamics. First Law: 'You don't get anything for nothing.' Second Law: 'You get damn little for sixpence.'
Faculty of Technology
The Open University