Stories We Like: A Guide to the Comma
A unified body of matter with no specific shape.
A grouping of individual parts or elements that compose a unified body of unspecified size or quantity.
The physical volume or bulk of a solid body.
Abbr. m The measure of the quantity of matter that a body or an object contains. The mass of the body is not dependent on gravity and therefore is different from but proportional to its weight.
A thick, pasty pharmacological mixture containing drugs from which pills are formed.
One of the seven fundamental SI units, the kilogram.
A measure of the amount of matter contained in or constituting a physical body. In classical mechanics, the mass of an object is related to the force required to accelerate it and hence is related to its inertia, and is essential to Newton's laws of motion. Objects that have mass interact with each other through the force of gravity. In Special Relativity, the observed mass of an object is dependent on its velocity with respect to the observer, with higher velocity entailing higher observed mass. Mass is measured in many different units; in most scientific applications, the SI unit of kilogram is used. See Note at weight. See also rest energy, General Relativity.