Thermodynamic Terms
Chapter Name : Thermodynamics |
Sub Topic Code : 102_11_06_01_03 |
Topic Name : Thermodynamic Terms |
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Sub Topic Name : The State Of The System |
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Introduction
• The system must be described by specifying quantitatively each of the properties such as its pressure (p), volume (V), and temperature (T ) as well as the composition of the system. • We need to describe the system by specifying it before and after the change. • We specify the state of the system by state functions or state variables. • Variables like p, V, T are called state variables or state functions because their values depend only on the state of the system and not on how it is reached.
Pre-Requisites:
Energy, transformation, equilibrium, thermodynamic system
Activity:
Example: In a cooking recipe it is mentioned to what degree the cake needs to be baked or at what temperature a particular dish needs to be cooked.
Real Life Question:
How do u describe a thermodynamic system?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
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| Thermodynamic system | • A system in thermodynamics is a space in which observations are made and remaining space constitutes the surroundings. |
Learning aids / Gadgets
| Gadgets | How it can be used |
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| Thermometer, Luke warm water in a glass. | The state of the system can be described by mentioning the temperature. |
Real life uses :
State of the system helps to define the characteristics of many energy transformation processes.
Places to visit :
Kitchen
Practical examples around us
| Examples | Explainations |
|---|---|
| Mixing salt in luke warm water | In this system, the state of the system is described by the amount of water taken, the temperature of the water etc. |
What you learn in Theory:
Thermodynamic systems are classified according to the exchange of energy or matter between the system and the surroundings.
What you learn in Practice:
State variables such as volume, temperature, pressure define the system.