An intensive property is?

An intensive property is defined as a property that does not depend on the amount of substance or the size of the system. This means that regardless of how much material is present, the intensive properties remain the same. Common examples of intensive properties include temperature, pressure, density, and color.

In contrast, extensive properties, such as mass and volume, do depend on the size of the system or the amount of substance present. Therefore, option B accurately describes intensive properties, as it highlights the independence from the size of the system.

Other options do not correctly characterize intensive properties: one mentions a direct relationship with the amount of substance, another implies a dependence on the past history of the system, and the last one specifies a general condition related to temperature changes, which does not encompass the broader scope of intensive properties. Thus, the clarity of option B aligns with the fundamental definition of what constitutes an intensive property in thermochemistry.