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Weytoll Stirling Engine Kit,Low Temperature Stirling Engine Motor Model Steam Heat Electricity Generator Machine Education Model Toy DIY Kits 【Heat Engine That Operates】A stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas (the working fluid) at different temperatures, such that there is a net conversion of heat energy to mechanical work.... Weytoll Stirling Engine Kit,Low Temperature Stirling Engine Motor Model Steam Heat Electricity Generator Machine Education Model Toy DIY Kits

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