Which of the following describes a condition of the ideal gas equation?

The ideal gas equation, represented as PV = nRT, requires certain conditions for the measurement units of its variables to ensure the calculations yield correct results. One essential condition is that temperature must be measured in Kelvin.

The Kelvin scale is an absolute temperature scale, meaning it starts at absolute zero (0 K), where all molecular motion ceases. This is important because the ideal gas law relates the temperature of gas to the kinetic energy of its particles. Using any other temperature scale, such as Celsius or Fahrenheit, would interfere with the proportional relationship described in the equation.

Using Kelvin allows for accurate calculations of gas behavior under various conditions, as it maintains the direct proportionality between temperature and energy. Therefore, the requirement of temperature being in Kelvin is fundamental to correctly apply the ideal gas law and obtain meaningful results.