McGrath, I was born in 1960 so I do remember the change over and working in LSD in primary school but I not well enough to remember whether I found it easy or not but I know which I would prefer to work with in computing terms.

I will stand by the imperial system as that was the system we used. The US may use the same names as we do but the actual quanities of a substance can differ, e.g. our gallon is 4.456 litres whereas the US gallon is 3.785 litres.

Jon