Answer: Absolute temperature.
- A Mass as frequently described
- B Absolute temperature
- C Molar mass in most textbook accounts
- D Density during normal conditions
Correct answer: B. Absolute temperature
Explanation: Charles Law states V is directly proportional to absolute temperature T, at constant pressure and amount of gas.
Boyle's law: at constant temperature the pressure of a fixed mass of gas is inversely proportional to its volume (P ∝ 1/V), so the P–V plot is a hyperbola — halving the volume doubles the pressure. Image: Reginaprice2013, CC BY-SA 3.0, via Wikimedia Commons.
Concept context
Discover why gases expand to fill any container while liquids flow and solids hold their shape. Master the gas laws, the ideal gas equation, and the reasons real gases deviate from ideal behavior.