Orchid XP v3 wrote:
> 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.

Regards,
John

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