By introducing the separate condenser, approximately how much fuel did Watt's improved engine require compared to the Newcomen design for the same work?

Answer

Less than one-quarter

The economic impact of the separate condenser was profound, allowing Watt's engine to operate on less than 25% of the fuel needed by the Newcomen engine to perform the same amount of work.

By introducing the separate condenser, approximately how much fuel did Watt's improved engine require compared to the Newcomen design for the same work?
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