The best replacement for ideal gas law is real gas law.

The best alternatives to ideal gas law are rated as following:
★★★★★  real gas law
★★★★  combined gas law
★★★★  van der waals

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Speaking about ideal gas law, one probably shouldn't forget about density.

Other search terms related to ideal gas law and their ratings are:
★★★★★ density
★ molecular weight
★ molar mass
density equation
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ideal gas law
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