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Welcome to eGyanKosh, your go-to resource for comprehensive educational materials from IGNOU. In this section, we present the study material for Unit-4: First Law of Thermodynamics, designed specifically for the IGNOU 2025 curriculum. Understanding the First Law of Thermodynamics is crucial for students diving into the fascinating world of physics and energy conservation principles. Here, you can access free downloads of high-quality resources that will enhance your learning experience and help you grasp fundamental concepts. Whether you’re preparing for exams or seeking to reinforce your knowledge, our curated study material will guide you through the intricacies of thermodynamic principles with ease and clarity.