First Law of Thermodynamics

The First Law of Thermodynamics chapter in Physics Thermodynamics provides calculators and learning tools for energy conservation in thermal processes, helping you work with internal energy changes, heat transfer, and work done by or on a system. You can solve common first-law setups such as heating at constant volume or pressure, isothermal and adiabatic cases at an introductory level, and energy balance problems that connect temperature changes to real materials.

This chapter is best for beginner to intermediate learners (high school through introductory university), while advanced users can use it to verify longer thermodynamics solutions quickly. It reinforces the meaning of state variables, sign conventions for heat and work, and how to choose the right model (ideal gas, calorimetry, or process-based equations) without getting lost in algebra or unit conversions.

Students, teachers, and self-learners can use these tools to compute heat added or removed, work from pressure–volume changes, and resulting temperature or internal energy changes, with step-by-step outputs that explain each decision. By making energy accounting clear and consistent, this page helps you avoid common mistakes, build intuition for engines and cycles, and prepare for later topics like entropy, the Second Law of Thermodynamics, and real-gas behavior.