Barometers

I used one of my favourite stories in Holy Trinity last night. It is about some amusing answers given to the physics examination question, 'Show how you could measure the height of a tall building using an ordinary domestic barometer.' It got a good few laughs and made its point but afterwards one of the young people, final year at school doing A levels, asked me what a barometer was. Lord help us all. I usually try and assume ignorance when preaching but I may have to assume greater levels than ever before. Not sure I'll be able to stand the pressure.