mass total mass 2025-04-10T16:14:12Z PATO:0103001 A quantitative quality that represents the sum of all 'mass' qualities of the component parts that constitute a whole entity. The total mass quality inheres in the whole entity and reflects the aggregate measure of mass across all its components, such that changes in the mass of individual components may not necessarily correspond to equivalent changes in the total mass of the whole. Example of usage: "total body mass" represents the sum of the masses of all tissues and organs in the body, while "liver mass" represents only the mass of the liver. An increase in liver mass does not necessarily mean an increase in total body mass, as the mass of other organs or tissues may decrease simultaneously. quality