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P-T diagram of an ideal gas having three different densities ρ 1 , ρ 2 , ρ 3 (in three different cases) is shown in the figure. Which of the following is correct :

1. ρ 2 < ρ 3
2. ρ 1 > ρ 2
3. ρ 1 < ρ 2
4. ρ 1 = ρ 2 = ρ 3

Correct answer: ρ 1 > ρ 2

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