Which of the following conditions affects the ideal gas behavior of a substance?

The ideal gas behavior of a substance is significantly influenced by both temperature and pressure. According to the ideal gas law, which is expressed as PV = nRT, where P represents pressure, V is volume, n is the number of moles of the gas, R is the ideal gas constant, and T is the absolute temperature, changes in temperature and pressure can alter the behavior of a gas.

At high pressures, gas particles are forced closer together, which can lead to deviations from ideal behavior. This is because real gases experience intermolecular forces and occupy a finite volume, which is not accounted for in the ideal gas law. Additionally, at very low temperatures, gases can condense into liquids or solids, further diverging from ideal gas assumptions.

In contrast, considering just one factor—such as temperature, volume, or the amount of gas—independently disregards the interconnected nature of all these factors that together define gas behavior in real-world conditions. Therefore, while temperature and pressure are critical, addressing their combined influence is essential for understanding deviations from ideal gas behavior.