LETTERS

摘要

I was very interested in the points Henry Ditmore made in 'Let's be optimistic' (Letters, 18 August) promoting the possible use of compressed air (CA) in commuter vehicles. Although not a sensible way of converting the heat/electrical energy of power stations into mechanical energy for the CA vehicle - due to the large heat loss during air compression - the letter does highlight a very important principle. That is, a CA cylinder can hold as much useful energy as a battery of similar weight. If the physical volume of the CA cylinder was also similar, Mr Ditmore may be missing something far more important about CA power than merely powering a small commuter vehicle. I wonder if you can guess what it is.