Certified Transport Registered Nurse Certification Practice Exam

Which gas law involves the concept of constant proportionality between volume and temperature for a given amount of gas?

1. Henry's Law

2. Avogadro's Law

3. Charles' Law

4. Dalton's Law

The correct answer is: Charles' Law

Charles' Law defines the relationship between the volume and temperature of a gas at a constant pressure. It states that the volume of a given mass of gas is directly proportional to its absolute temperature (measured in Kelvin) when the pressure is held constant. This means that as the temperature increases, the volume of the gas also increases, and vice versa, assuming the amount of gas and its pressure do not change. The law can be mathematically stated as V/T = k, where V is the volume, T is the absolute temperature, and k is the constant of proportionality. This fundamental relationship is instrumental in understanding behaviors of gases under varying thermal conditions, particularly in transport settings where temperature variations can impact the volume and consequently the pressure and safety of gas-containing systems. The other gas laws mentioned focus on different aspects of gas behavior: Henry's Law relates to solubility of gases in liquids, Avogadro's Law pertains to the relationship between volume and the number of moles of gas, and Dalton's Law addresses the partial pressures of mixtures of gases.