Glossary term: Mass

Description: Mass is the amount of matter a body contains and is the basic property by which the resistance of a body is measured to accelerate when a force is exerted on it by a certain amount. The number, type, and density of atoms that make up the body combine to determine the mass of that body. Mass is often measured by the weight of the body, although weight is not the same thing as the mass remains the same regardless of location. The kilogram (kg) is the internationally recognized unit of mass measurement (other units can be used such as: grams, milligrams, ton, ounce, and pound), and mass is represented by the symbol m. Mass is a scalar quantity. Finally, while massless particles exist, no physical object has a mass equal to zero.

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The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".