Based on the introduction of the concept of ideal gas, properties of ideal gas and real gas in four basic processes such as the isothermal expansion, the adiabatic free expansion, the throttling expansion and reversible adiabatic expansion were an-alyzed.Through the analysis students could better understand and master the first law of thermodynamics in the application of the ideal gas and real gas.%在介绍理想气体概念的基础上，分析了理想气体和实际气体在等温膨胀、绝热自由膨胀、节流膨胀和绝热可逆膨胀4种基本过程中的性质。通过分析总结，以便学生深刻理解并掌握热力学第一定律在理想气体和实际气体中的应用。
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