Chapter 21 Temperature
Chapter 21 Temperature
21-1 Temperature and thermal equilibrium 1. Thermal equilibrium (a) Adiabatic(绝热)( thermally insulating) Fig 21-1 shows two systems A and b, they are isolated from one another and from their environment by which A B we mean that neither energy nor matter can enter or leave either system Fig 21-1
21-1 Temperature and thermal equilibrium 1. Thermal equilibrium (a) Adiabatic(绝热) ( thermally insulating ) Fig 21-1 shows two systems A and B, they are isolated from one another and from their environment, by which we mean that neither energy nor matter can enter or leave either system. Fig 21-1 A B TA TB
For example, the systems may be surrounded by WQl∥ made of thick slabs of styrofoam(泡沫聚苯乙烯 (b) Diathermic(热透性) means thermally conducting (c Thermal equilibrium When the two system are placed in contact through a diathermic wall, the passage of heat energy through the wall causes the properties of
For example, the systems may be surrounded by wall made of thick slabs of styrofoam(泡沫聚苯乙烯). (b) Diathermic(热透性), means thermally conducting (c) Thermal equilibrium When the two system are placed in contact through a diathermic wall, the passage of heat energy through the wall causes the properties of
two system to change. The changes goes to until finally all measured properties of each system approach constant values. When this occurs, we say that the two systems are in thermal equilibrium with each other 2. Zeroth law of thermodynamics If system a and b are each in thermal equilibrium with a third system C, then a and b are in thermal equilibrium with each other
two system to change. The changes goes to until finally all measured properties of each system approach constant values. When this occurs, we say that the two systems are in thermal equilibrium with each other. 2. Zeroth law of thermodynamics “If system A and B are each in thermal equilibrium with a third system C, then A and B are in thermal equilibrium with each other
The zeroth law underlies the concept of temperature 3.Temperature When two system are in thermal equilibrium we say that they have the same temperature
The zeroth law underlies the concept of temperature . 3. Temperature When two system are in thermal equilibrium we say that they have the same temperature