What did the 17th-century physicist Christiaan Huygens attempt to use as a power source in his early engine design?
Answer
Gunpowder
In the late 17th century, early efforts to harness mechanical energy involved the use of explosive materials. The core idea was to exploit the immense power created during rapid expansion. By utilizing the detonation of gunpowder within a cylinder, the intention was to drive a piston and then leverage the resulting vacuum to perform work. Although this demonstrated an understanding of energy release, the immense danger and instability associated with managing such detonations meant that this remained a theoretical concept rather than a practical, functioning machine.

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