Thermodynamic Terms
Chapter Name : Thermodynamics |
Sub Topic Code : 102_11_06_01_04 |
Topic Name : Thermodynamic Terms |
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Sub Topic Name : The Internal Energy as a State Function - Work |
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Introduction
• The internal energy, U of the system, represents the total energy of the system It may change, when: • Heat passes into or out of the system. • Work is done on or by the system. • Matter enters or leaves the system.
Pre-Requisites:
System, heat
Activity:
Heating water by immersion rod.
Real Life Question:
Does a glass of water sitting on a table have any energy?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Internal energy | Internal energy is the state function. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| A glass of water | A glass of water has internal energy even if it’s stable. |
Real life uses :
• Internal energy, U, of the system is a state function. • The positive sign expresses that wad is positive when work is done on the system. • wad will be negative, if the work is done by the system.
Places to visit :
Bathroom.
Practical examples around us
| Examples | Explainations |
|---|---|
| Change in internal energy | This can be brought by simply heating water in bucket by and immersion rod, or by doing mechanical work, like churning the water. |
What you learn in Theory:
Enthalpy doesn’t depend on the path.
What you learn in Practice:
Enthalpy doesn’t depend on the path.