Which of the following properties change with the amount of substance present?

Which of the following properties change with the amount of substance present?

• A. Pressure
• B. Temperature
• C. Volume
• D. Density

Answer: (C)

Volume is a property that changes with the amount of substance present. As the quantity of a substance increases or decreases, the volume it occupies will also change correspondingly, assuming the conditions under which it exists do not change significantly (such as temperature and pressure in gases). In contrast, properties like temperature are intensive; they do not depend on the size or amount of the substance. Regardless of how much of a substance you have, its temperature remains the same unless energy is transferred to or from it. Pressure can also be considered an intensive property under certain conditions, particularly for solids and liquids where it relates to the force applied per unit area, independent of the extent of the material. Density is another intensive property, defined as mass per unit volume, which remains constant for a pure substance at a given temperature and pressure, regardless of how much of the substance you have. Thus, the only property among those listed that directly varies with the amount of substance is volume.

Volume is a property that changes with the amount of substance present. As the quantity of a substance increases or decreases, the volume it occupies will also change correspondingly, assuming the conditions under which it exists do not change significantly (such as temperature and pressure in gases).

In contrast, properties like temperature are intensive; they do not depend on the size or amount of the substance. Regardless of how much of a substance you have, its temperature remains the same unless energy is transferred to or from it. Pressure can also be considered an intensive property under certain conditions, particularly for solids and liquids where it relates to the force applied per unit area, independent of the extent of the material. Density is another intensive property, defined as mass per unit volume, which remains constant for a pure substance at a given temperature and pressure, regardless of how much of the substance you have.

Thus, the only property among those listed that directly varies with the amount of substance is volume.