What is one characteristic of an ideal gas?

An ideal gas is characterized by its ability to follow gas laws, such as the Ideal Gas Law (PV=nRT) with precision under a variety of temperature and pressure conditions. This means that the behavior of an ideal gas can be predicted accurately and consistently, assuming no deviations occur. In reality, no gases perfectly adhere to this ideal behavior; however, under certain conditions of high temperature and low pressure, many real gases approximate ideal behavior closely. This characteristic is essential for simplifying calculations and understanding gas behavior in a theoretical context.

Other options present characteristics that do not align with the definition of an ideal gas. For instance, the volume of an ideal gas is considered negligible compared to the container it occupies, and intermolecular forces are assumed to be absent, which is contrary to option A. While option C acknowledges that an ideal gas is a theoretical concept, it overlooks the importance of its predictive capabilities under specified conditions. Option D highlights an irrelevant aspect because an ideal gas expanding to fill a container is a general behavior of all gases, not a unique characteristic. Thus, selection B accurately reflects a fundamental aspect of an ideal gas.