First Law of Thermodynamics Calculator
🔥 Thermochemistry & Bonding. Use the First law of thermodynamics formula to find δu, heat in q, work on system w: pick the value you want, type the others, and the answer updates as you go.
ΔU300 J
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| ΔU | J |
| Heat in q | J |
| Work on system w | J |
Worked example
Find the δu when Heat in q = 500 J, Work on system w = -200 J.
Using Δ U = q + w: ΔU = 300 J.
Frequently asked questions
What is the formula for First law of thermodynamics?
Δ U = q + w.
What do the letters stand for, and what units are used?
ΔU in J, Heat in q in J, Work on system w in J.
How do you calculate δu?
Put the values into Δ U = q + w. For example, with Heat in q = 500 J, Work on system w = -200 J, δu = 300 J.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (δu, heat in q, work on system w) and fill in the others: it rearranges the formula for you.
