Under which condition will the mass of an object remain unchanged while its weight varies?

The mass of an object is a measure of the amount of matter it contains, and it remains constant regardless of changes in gravitational force. Weight, on the other hand, is the product of mass and gravitational acceleration (W = m * g). Therefore, if the gravitational force changes—such as when moving from one celestial body to another, like from Earth to the Moon—the weight of the object changes because the gravitational acceleration (g) is different. However, the mass (m) stays the same since it is an intrinsic property of the object. This is why the selected answer accurately reflects the relationship between mass and weight in varying gravitational conditions.

In contrast, temperature changes, volume increases, or changes in density do not directly influence the inherent mass of an object. While these factors can affect other properties of the object, such as its shape or how it floats in a fluid, they do not change the total amount of matter present, which is what mass represents.