Fill in every field except the one you want — the empty field is solved for. Mix any units you like.
V = 22.414 L
- P
- 101.33 kPa
- V
- 22.414 L
- n
- 1 mol
- T
- 273.15 K
Solved in SI units with R = 8.314 462 618 J·mol⁻¹·K⁻¹ (equivalently 0.082 057 L·atm·mol⁻¹·K⁻¹), then converted back to your chosen unit. Real gases deviate from ideal behaviour at high pressure and low temperature.
How it works
Every input is converted to SI — pascals, cubic metres, kelvin — and the equation is solved with the exact SI gas constant R = 8.314 462 618 J·mol⁻¹·K⁻¹. The answer is converted back into whichever unit you picked for it. The combined gas law mode solves P₁V₁/T₁ = P₂V₂/T₂ the same way, for a fixed amount of gas changing from one state to another.
Frequently asked questions
- What is the ideal gas law?
- PV = nRT: pressure × volume = moles × the gas constant × absolute temperature. It connects the four properties of a gas, so knowing any three gives the fourth.
- Which value of R should I use?
- It depends on your units: 0.082 057 L·atm/(mol·K), 8.314 J/(mol·K) = 8.314 L·kPa/(mol·K), or 62.364 L·mmHg/(mol·K). This calculator converts everything to SI internally, so you never need to choose.
- Why must temperature be in kelvin?
- Gas laws describe proportionality to absolute temperature. At 0 °C a gas still has plenty of volume, so doubling from 10 °C to 20 °C does not double anything — going from 283 K to 293 K is only a 3.5% increase.
- What volume does one mole of gas occupy?
- About 22.41 L at 0 °C and 1 atm, and about 22.71 L at IUPAC’s standard 0 °C and 100 kPa. At room temperature (25 °C, 1 atm) it is about 24.5 L.
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