自发过程的方向性 (Direction of Spontaneous Process) 自发过程:不需要任何外界作用而自动进行的过程。 Such as(例如:) a heat transfer driven by finite temperature difference(有限温差传热) b, work is converted into heat by friction 通过摩擦功转变为热) C Free or unrestrained expansion (空气向真空自由膨胀) d. Mixing process of different substances (不同的流体混合)自发过程的方向性 (Direction of Spontaneous Process) 自发过程：不需要任何外界作用而自动进行的过程。 Such as (例如：) a. heat transfer driven by finite temperature difference (有限温差传热) b. work is converted into heat by friction (通过摩擦功转变为热) c. Free or unrestrained expansion (空气向真空自由膨胀)。 d. Mixing process of different substances (不同的流体混合)