Like lots of people I couldn't tell you what an acre was other than 'the size of a field'.

A furlong I know of as the length of a race course, and it's a term only used by sports commentaters on a saturday.

A chain? That's a new one on me...

The sooner we get rid of the archaic language that just seems to be there to confuse the better. I can cope with miles per gallon and beer in pints. Let's leave it there shall we.