GED Science TestPhysical ScienceHard
A scientist is studying the behavior of a gas in a sealed container. When they heat the container, they observe that the pressure inside the container increases, while the volume remains constant. Which gas law best describes this observation?
- AGay-Lussac's Law
- BCharles's Law
- CBoyle's Law
- DCombined Gas Law
Show answer & explanationAnswer & explanation
Correct answer: A. Gay-Lussac's Law
Gay-Lussac's Law states that for a fixed amount of gas at constant volume, the pressure is directly proportional to its absolute temperature. As temperature increases, pressure increases, which matches the observation.
Why the other options are wrong
- B. Charles's Law relates volume and temperature at constant pressure.
- C. Boyle's Law relates pressure and volume at constant temperature.
- D. The Combined Gas Law relates pressure, volume, and temperature, but this scenario specifies constant volume for a simpler relationship.
Gay-Lussac's Law
Gay-Lussac's Law states that for a fixed amount of gas at constant volume, the pressure is directly proportional to its absolute temperature. As temperature increases, pressure increases proportionally.
- P₁/T₁ = P₂/T₂
- Temperature must be in Kelvin
- Volume and amount of gas are constant
Memory trick: Gay-Lussac's PT is always On (Pressure-Temperature)