Thermodynamics of Pure Substances

📋 Course Outline

1. Definition and characteristics of pure substances
2. Phases of pure substances: compressed liquid, saturated liquid, saturated vapor, and superheated vapor
3. Saturation temperature and pressure and the saturation curve for pure substances
4. Phase equilibrium diagrams and key points: triple point and critical point
5. Quality and humidity of liquid-vapor mixtures and property calculations based on quality
6. Use and interpretation of thermodynamic tables: enthalpy and entropy
7. Determining phase states using pressure, temperature, and critical properties
8. Application of thermodynamic tables to solve phase and property problems for water
9. Calculations involving volume, pressure, temperature, quality, and enthalpy in rigid containers

📖 1. Definition and characteristics of pure substances

🔑 Key Concepts & Definitions

• Sustancia pura : chemical substance that exhibits a homogeneous and invariable composition throughout all its parts, even when it exists in different phases. It can be a single element, a compound, or a homogeneous mixture of elements or compounds. A mixture of chemically distinct regions, such as oil and water, is not classified as a pure substance. For example, air is often treated as a pure substance because it maintains a uniform chemical composition despite being a mixture of gases.

📝 Essential Points