GED Science TestPhysical ScienceMedium
A scientist is studying the properties of a gas in a sealed container with a movable piston. They observe that as the temperature of the gas is increased, the volume of the gas also increases, assuming the pressure remains constant. This observation is consistent with which of the following gas laws?
- ABoyle's Law.
- BGay-Lussac's Law.
- CAvogadro's Law.
- DCharles's Law.
Show answer & explanationAnswer & explanation
Correct answer: D. Charles's Law.
Charles's Law states that for a fixed amount of gas at constant pressure, the volume of the gas is directly proportional to its absolute temperature. As temperature increases, volume increases.
Why the other options are wrong
- A. Boyle's Law describes the inverse relationship between pressure and volume at constant temperature.
- B. Gay-Lussac's Law describes the direct relationship between pressure and temperature at constant volume.
- C. Avogadro's Law describes the direct relationship between volume and the number of moles at constant temperature and pressure.
Charles's Law
A gas law stating that at constant pressure, the volume of a given mass of an ideal gas is directly proportional to its absolute temperature.
- V₁/T₁ = V₂/T₂ (or V ∝ T).
- Temperature must be in Kelvin.
- Applies when pressure and number of moles are constant.
Memory trick: PB TV: Boyle's Pressure-Volume, Charles's Temperature-Volume.