LaTeX
\Delta U=Q-WVariables
- Define every symbol and unit before substitution.
- Check the domain, shape, and convention required by the formula.
How to use this formula
Relates internal-energy change, heat, and work under a stated sign convention.
Important notes
- Verify assumptions and units before applying the expression.
- Keep exact values until the final rounding step when possible.
Quick example
Use the first law of thermodynamics with a small known example, then verify the result independently.
Applicability, worked calculation, and verification
Assumptions and domain checks
- For the First Law of Thermodynamics, verify assumptions and units before applying the expression.
- Use dimensionally consistent units and the sign, coordinate, and reference-frame conventions stated for the problem.
Worked example
Use the first law of thermodynamics with a small known example, then verify the result independently.
Common mistakes
- Do not combine values with inconsistent units or sign conventions in First Law of Thermodynamics; perform a dimensional check before accepting the result.
- Verify the result of First Law of Thermodynamics with a known case, inverse operation, dimensional check, or independent calculation before publishing it.
Continue the workflow
Use First Law of Thermodynamics in your own work
- Check the domainMatch the variables and assumptions to the problem before substituting values.
- Copy the exact notationPreserve grouping, signs, and exponents in
\Delta U=Q-W. - Edit or convertOpen the expression in the LaTeX editor, then export it for your document or web page.
Review and verification
Last reviewed: 2026-07-23
Automated quality check: Kept noindex until the missing evidence is supplied.
Formula references
- College Physics 2eOpenStax, Rice University — Reviewed physical quantities, units, mechanics, energy, waves, electricity, and applied formulas.
Frequently asked questions
What is the First Law of Thermodynamics used for?
Relates internal-energy change, heat, and work under a stated sign convention.
Can I copy this formula as LaTeX?
Yes. Copy \Delta U=Q-W or open it in the LaTeX editor.
What should I check before using it?
Confirm that each variable, unit, domain restriction, and assumption matches the problem.