First Law of Thermodynamics
| Formula / Notation | ΔU = q + w |
|---|---|
| Also Known As | Law of energy conservation, thermodynamic first law, conservation of energy |
What is First Law of Thermodynamics?
The First Law of Thermodynamics is a statement of energy conservation: energy cannot be created or destroyed, only converted from one form to another. For a thermodynamic system, the change in internal energy (ΔU) equals the heat added to the system (q) plus the work done on the system (w). It establishes that the total energy of an isolated system remains constant.
Formula & Notation
Other Names / Synonyms: Law of energy conservation, thermodynamic first law, conservation of energy
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The First Law of Thermodynamics is a statement of energy conservation: energy cannot be created or destroyed, only converted from one form to another. For a thermodynamic system, the change in internal energy (ΔU) equals the heat added to the system (q) plus the work done on the system (w). It establishes that the total energy of an isolated system remains constant.
Engineering thermodynamic calculations. Heat engine and refrigerator efficiency. Chemical reaction energy balance. Phase transition calculations. Internal combustion engine design. Power plant design. Industrial process energy auditing.
Conceptual law — no direct safety concerns. Practical applications (engines, reactors) have their own specific hazards. Misapplication in design calculations could lead to dangerous underestimation of energy release.
The formula or notation for First Law of Thermodynamics is: ΔU = q + w