What does the ideal gas law allow a scientist to calculate that the other gas laws do not?

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Answer 1 · 2015-05-26T18:41:52

Quick answer: nothing.

There are four gas laws.

Volume is inversely proportional to pressure, or $PV = k$ .

Volume is directly proportional to temperature, or $V/T = k$

Gay-Lussac's or Amonton's Law

Pressure is directly proportional to temperature, or $P/T = k$

Volume is directly proportional to the number of moles, or $V/n = k$

Put them all together, and you get

$(PV)/(nT) = k$ or $PV = nkT$

We usually replace the constant $k$ with the universal gas constant $R$ and write the equation as

$PV = nRT$

antranik.org

The Ideal Gas Law is simply a combination of the other four gas laws.