Imperial and US customary measurement systems different concepts – the imperial gallon is defined in terms of the volume occupied by a specified mass of water, while the US gallon is specified in terms of cubic linear measure. Notes Notes Units of weight in both the imperial and US customary system always used the same standard, though differences in multiples of the avoirdupois pound developed in the nineteenth century. Both systems used the three different scales – the avoirdupois system for general use, the troy system for precious metals and the apothecaries system in the pharmacy industry. The term "weight" and "mass" are used interchangeably in
Precious McKenzie Precious McKenzie Precious McKenzie MBE (born 6 June 1936) is a South African-born former weightlifter who won Commonwealth titles representing both England and New Zealand and has won several World powerlifting and Masters World powerlifting titles. He is of diminutive stature at 1.45m (4' 9"). Born in Durban, South Africa, Precious McKenzie suffered from ill-health during his childhood. An ambition to be a circus performer ended because of South Africa's race laws and this led him to weight training and weightlifting. Although he was ranked the best weightlifter in his weight category in South Africa, he was barred from representing