>> Can anybody suggest why this might be?
> 
> It's because heat represents a huge amount of energy.
> 
> For instance, the humble calorie, the amount of energy required to raise 
> a single gram of water by one degree celsius, is the same amount of 
> energy required to lift that same gram of water about 387 meters in 
> Earth's gravity, or accelerate it from zero to 87 meters per second.

Damn... pitty we can't use heat to do *useful* stuff!

-- 
http://blog.orphi.me.uk/

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