There are two ways of energy exchange(能量交换) between the system and its surroundings. Their effects are that the state of system may change. 状态改变 交换热量 Thermodvnamic system 物质 its surroundings 做功
There are two ways of energy exchange（能量交换） between the system and its surroundings. Their effects are that the state of system may change. its surroundings Thermodynamic system 交换热量 物质 做功 状态改变
Heat is energy that flows(流动) from one body to another because of a temperature difference between them Cold system Heat (Q) Hot surrounding Question: Is the heat something having mass
Heat is energy that flows（流动） from one body to another because of a temperature difference between them. Hot surrounding Cold system Question: Is the heat something having mass? Heat（Q）
Work (W) is related to forces and mechanical energy. Mechanical energy heat energy Heat energy Mechanical energy
Work（W） is related to forces and mechanical energy. W W Mechanical energy heat energy Heat energy Mechanical energy
加热搅拌作功 热与功的等效性
加热 搅拌作功 热与功的等效性
传热(Q)和作功(W)是系统与外界交换能 量的两种形式,从能量传递的角度来讲,它们是 等价的。 但是,系统与外界进行热交换和作功的“方 式”截然不同,这将带来许多“美妙、奇特” 的现象 8 热的单位:cal卡(传统的原因 calorie),现统一为 焦尔J(Joue) Ical=4.18J
传热（Q）和作功（W）是系统与外界交换能 量的两种形式，从能量传递的角度来讲，它们是 等价的。 但是，系统与外界进行热交换和作功的“方 式”截然不同，这将带来许多“美妙、奇特” 的现象。 1cal = 4.18J 热的单位：cal卡(传统的原因calorie），现统一为 焦尔J(Joule)