Ideal Gas Law Governs Volume Changes

Steps:

• Recall PV = nRT, where V is proportional to T and inversely proportional to P (n constant).
• Identify changes: decreasing P increases V; increasing T increases V.
• Evaluate options: A combines both favorable changes.
• Confirm A maximizes volume increase.

Why A is correct:

• Per the combined gas law (P1V1/T1 = P2V2/T2), decreasing P and increasing T directly expand V.

Why the others are wrong:

• B: Increasing P compresses V; T unchanged offers no expansion.
• C: Increasing P and decreasing T both reduce V.
• D: Decreasing T contracts V; P unchanged provides no countereffect.

Final answer: A