Combined gas law calculator
For a sealed sample, PV/T is constant. Boyle, Charles and Gay-Lussac are all special cases of the one relation.
kPa
kPa
Final volume
0.5L
- Change in volume
- -50.00 %
Show the working
- Starting pressure = 101.325
- Starting volume = 1
- Starting temperature = 20
- Final pressure = 202.65
- Final temperature = 20
- t1k = 20 + 273.15 = 293.15
- t2k = 20 + 273.15 = 293.15
- Final volume = 101.325 * 1 * 293.15 / (293.15 * 202.65) = 0.5
- Change in volume = (0.5 - 1) / 1 * 100 = -50
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- P1 V1 / T1 = P2 V2 / T2
- V2 = P1 V1 T2 / (T1 P2)
Temperatures are converted to kelvin first; using Celsius directly is the classic way to get this wrong.