The First Law of Thermodynamics (23) A container with boiling water placed in a room cools off and finally comes into thermal equilibrium at the room temperature tells us: Heat is a form of energy that flows between a system and its surrounding because of a temperature difference between them. Abstractly: Any system participating in any thermodynamic process is able to transfer certain amount of energy either into or out of the system. The energy exchanged between the system and its environment appears as either heat or work or as both of them. This means that a system does not contain heat or work. Only through a thermodynamic process in which a system evolves from one equilibrium state to another can we talk about energy transfer. Later, we learn (I hope that would be the case), that heat Q and work W are not intrinsic thermodynamic properties of a system and are not state functions such as temperature, internal energy, entropy, … Heat Transfer The mechanisms by which a system and its environment transfer heat are found to fall into three methods: conduction, convection and Radiation. In this course we pay attention to thermal conduction and state a few facts about thermal convection and thermal radiation processes. Thermal Conduction
The First Law of Thermodynamics (23) A container with boiling water placed in a room cools off and finally comes into thermal equilibrium at the room temperature tells us: Heat is a form of energy that flows between a system and its surrounding because of a temperature difference between them. Abstractly: Any system participating in any thermodynamic process is able to transfer certain amount of energy either into or out of the system. The energy exchanged between the system and its environment appears as either heat or work or as both of them. This means that a system does not contain heat or work. Only through a thermodynamic process in which a system evolves from one equilibrium state to another can we talk about energy transfer. Later, we learn (I hope that would be the case), that heat Q and work W are not intrinsic thermodynamic properties of a system and are not state functions such as temperature, internal energy, entropy, … Heat Transfer The mechanisms by which a system and its environment transfer heat are found to fall into three methods: conduction, convection and Radiation. In this course we pay attention to thermal conduction and state a few facts about thermal convection and thermal radiation processes. Thermal Conduction