Activity may refer to: * Action (philosophy), in general * Human activity:

human behavior Human behavior is the potential and expressed capacity ( mentally, physically, and socially) of human individuals or groups to respond to internal and external stimuli throughout their life. Kagan, Jerome, Marc H. Bornstein, and Richard M. ...

, in sociology behavior may refer to all basic human actions, economics may study human economic activities and along with cybernetics and psychology may study their modulation * Recreation, or activities of leisure * The Aristotelian concept of

energeia In philosophy, potentiality and actuality are a pair of closely connected principles which Aristotle used to analyze motion, causality, ethics, and physiology in his ''Physics'', ''Metaphysics'', '' Nicomachean Ethics'', and ''De Anima''. Th ...

, Latinized as ''actus'' *

Activity (UML) An activity in Unified Modeling Language (UML) is a major task that must take place in order to fulfill an operation contract. ThStudent Guide to Object-Oriented Developmentdefines an activity as a sequence of activities that make up a process. Ac ...

, a major task in Unified Modeling Language * ''Activity'', the rate of catalytic activity, such as enzyme activity (

enzyme assay Enzyme assays are laboratory methods for measuring enzymatic activity. They are vital for the study of enzyme kinetics and enzyme inhibition. Enzyme units The quantity or concentration of an enzyme can be expressed in molar amounts, as with a ...

), in physical chemistry and enzymology *

Thermodynamic activity In chemical thermodynamics, activity (symbol ) is a measure of the "effective concentration" of a species in a mixture, in the sense that the species' chemical potential depends on the activity of a real solution in the same way that it would depe ...

, the effective concentration of a solute for the purposes of mass action *

Activity (project management) In project management, a task is an activity that needs to be accomplished within a defined period of time or by a deadline to work towards work-related goals. It is a small essential piece of a job that serves as a means to differentiate various ...

* Activity, the number of radioactive decays per second *

Activity (software engineering) Activity diagrams are graphical representations of workflows of stepwise activities and actions with support for choice, iteration and concurrency. In the Unified Modeling Language, activity diagrams are intended to model both computational and o ...

Activity (soil mechanics) The Atterberg limits are a basic measure of the critical water contents of a fine-grained soil: its shrinkage limit, plastic limit, and liquid limit. Depending on its water content Water content or moisture content is the quantity of water conta ...

* , an aircraft carrier of the Royal Navy * "Activity", a song by Way Out West from ''

Intensify ''Intensify'' is the second studio album by English electronic music duo Way Out West, released on 20 August 2001 by Distinct'ive Records. The album was marked by a move from the defunct Deconstruction Records label to Distinctive, and a chang ...

'' * Cultural activities, activities referred to culture.

See also