Temperature, Thermal Equilibrium, and Zeroth Law
|Introduction||What is this thing called Thermodynamics??? | Definitions | Thermal Equilibrium and Zeroth Law | Limitations|
|First Law||Work, Heat, Energy, and the First Law | Work, Heat, Energy, and the First Law (simplied) | Derivatives | Derivatives Exercise | Reversibility, Enthalpy, and Heat Capacity|
|Second Law||Things to Think About | Observations and Second Law of Thermodynamics | Alternative Approach - the Clausis Inequality | Consequences of the Second Law | Consequences of the Second Law (simplified) | Carnot Principle - motivation and examples | Equivalence of Second Law Statements*|
|Third Law||Third Law of Thermodynamics | Consequences of Third Law*|
|Development of Thermodynamics||The Thermodynamic Network | Network Exercise | Equations of State | Thermochemistry|
* Optional Section
The definition of temperature is very problematic. The problem is that we cannot define temperature from a macroscopic viewpoint.
A microscopic definition can be developed from statistical thermodynamics, but that is an advanced topic.
Units of Temperature
Temperature in thermodynamics is always given as absolute temperature.
Absolute temperature unit is Kelvin
- Kelvin = °C + 273
Note that the unit is a Kelvin not a "degree Kelvin" and no degree symbol is used.
Even though we cannot define temperature, We can define the concept of thermal equilibrium
- Thermal Equilibrium
- When two systems (or subsystems) have the same temperature
Zeroth Law of Thermodynamics