How to use the reduced temperature and pressure calculator
Find the reduced temperature and pressure of a gas to use with generalised gas charts. Enter temperature, pressure, critical temperature, critical pressure in the fields above; the reduced temperature, reduced pressure are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “reduced temperature”, “reduced pressure”, “corresponding states”, “calculate reduced temperature and pressure”, “find reduced temperature”.
Formula
Variables
- T — Temperature (K)
- P — Pressure (bar)
- Tc — Critical temperature (K)
- Pc — Critical pressure (bar)
Worked example
With temperature = 300 K, pressure = 50 bar, critical temperature = 304.1 K, critical pressure = 73.8 bar, the calculator gives reduced temperature ≈ 0.9865176; reduced pressure ≈ 0.6775068.
Frequently asked questions
What is the reduced temperature and pressure calculator used for?
Find the reduced temperature and pressure of a gas to use with generalised gas charts. It helps with questions such as “reduced temperature”, “reduced pressure”, “corresponding states”.
What is the formula for the reduced temperature and pressure calculation?
Reduced temperature = T / Tc. Reduced pressure = P / Pc. Here T is temperature (K), P is pressure (bar), Tc is critical temperature (K), Pc is critical pressure (bar).
What inputs do I need for the reduced temperature and pressure calculator?
You need temperature in K, pressure in bar, critical temperature in K, critical pressure in bar. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the reduced temperature and pressure calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the reduced temperature and pressure result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.