Скачать или смотреть Physics 101: Chapter 4-Part I-Thermal Physics, Temperature Scales & Thermal Expansion

In this video, Dr. Mohamed Ali explains the fundamentals of Thermal Physics (Chapter 4). We break down the difference between Heat and Temperature, master the conversion between Celsius, Fahrenheit, and Kelvin, and dive deep into the laws of Thermal Expansion with real-world applications in engineering and dentistry.

If you are a university student (Medicine, Dentistry, or Engineering) struggling with Thermodynamics, this lecture covers everything you need to know.

Chapter 4: Thermal Physics[00:00] Introduction: Overview of Thermal Physics, Heat, and Temperature.[00:48] Temperature vs. Heat: Defining internal energy and thermal equilibrium.[01:37] The Zeroth Law of Thermodynamics: Explanation and diagram analysis.[02:38] Temperature Scales: Celsius, Fahrenheit, and Kelvin comparison.[03:39] Example 4-1: Converting 75°F to Celsius and -2.0°C to Fahrenheit.[04:35] The -40° Convergence: Proving where Celsius and Fahrenheit are equal.[05:53] Absolute Zero: Concept and the Constant Volume Gas Thermometer.[06:52] Example 4-2: Calculating gas pressure using the constant volume thermometer.[08:42] Exercise 4-1: Converting 55°F to Kelvin.Thermal Expansion[09:43] Linear Expansion: Formula ($\Delta L = \alpha L_0 \Delta T$) and coefficient of expansion.[10:49] Conceptual Checkpoint: Comparing the expansion of two rods with different lengths.[12:02] Example 4-2 (Eiffel Tower): Calculating thermal contraction in winter.[13:10] Applications: Bimetallic strips (Thermostats) and anti-scalding valves.[14:14] Engineering Applications: Expansion joints in bridges and pipelines.[15:12] Area Expansion: Formula and derivation ($\Delta A \approx 2\alpha A \Delta T$).[16:34] Conceptual Checkpoint: Does a hole in a washer expand or shrink?[17:31] Volume Expansion: Formula ($\Delta V = \beta V \Delta T$).[18:27] Example 4-3 (The Oil Spill): Calculating overflow from a copper flask.Special Properties of Water[19:43] Anomalous Expansion: Why water is densest at 4°C.[20:24] Burst Pipes: The mechanics of ice expansion in plumbing.[21:00] Lake Freezing: Why ice forms on the surface and protects marine life.[22:14] Clinical Application: Thermal expansion challenges in Dentistry (fillings and dentures).[23:20] Conclusion: Summary and closing remarks.