Activity may mean:
- Action (philosophy) In philosophy, action has developed into a sub-field called philosophy of action. Action is what an agent can do, in general
- the Aristotelian concept of energeia Energeia is an important Greek technical term in the works of Aristotle. The two components of his coinage indicate something being "in work". It is the etymological source of the modern word "energy" but the term has evolved so much during Western History that this link is no longer helpful in understanding the original, Latinized as actus
- physical activity Physical exercise is any bodily activity that enhances or maintains physical fitness and overall health. It is performed for many different reasons. These include strengthening muscles and the cardiovascular system, honing athletic skills, weight loss or maintenance and for enjoyment. Frequent and regular physical exercise boosts the immune system,
- mental activity Mental or psychic energy or activity is the concept of a principle of activity powering the operation of the mind, soul or psyche. The idea harks back to Aristotle's conception of actus et potentia. "Energy" is here used in the literal meaning of "activity" or "operation". Henry More in his 1642 Psychodia platonica;
- Activity (chemistry) In chemical thermodynamics activity is a measure of the “effective concentration” of a species in a mixture. By convention, it is a dimensionless quantity. The activity of pure substances in condensed phases (solid or liquids) is normally taken as unity. Activity depends on temperature, pressure and composition of the mixture, among other
- Activity (UML) An activity in Unified Modeling Language is a major task that must take place in order to fulfill an operation contract. Activities can be represented in activity diagrams
- Activity, an alternative name for the game charades Charades or charade is a word guessing game. In the form most played today, it is an acting game in which one player acts out a word or phrase, often by pantomiming similar-sounding words, and the other players guess the word or phrase. The idea is to use physical rather than verbal language to convey the meaning to another party. It is also
- Activity, a task In common language, a task is part of a set of actions which accomplish a job, problem or assignment. Task is a synonym for activity although the latter carries a connotation of being possibly longer duration.
- Activity, the ability of a piece to influence the game in chess Chess is a board game played between two players. It is played on a chessboard, which is a square-checkered board with 64 squares arranged in an eight-by-eight grid. At the start, each player controls sixteen pieces: one king, one queen, two rooks, two knights, two bishops, and eight pawns. The object of the game is to checkmate the opponent's
- Activity, the rate of a catalytic Catalysis is the process in which the rate of a chemical reaction is either increased or decreased by means of a chemical substance known as a catalyst. Unlike other reagents that participate in the chemical reaction, a catalyst is not consumed by the reaction itself. The catalyst may participate in multiple chemical transformations. Catalysts reaction, such as enzyme activity Enzyme assays are laboratory methods for measuring enzymatic activity. They are vital for the study of enzyme kinetics and enzyme inhibition, in physical chemistry Physical chemistry is the explanation of macroscopic, microscopic, atomic, subatomic, and particulate phenomena in chemical systems in terms of physical concepts; sometimes using the principles, practices and concepts of physics like thermodynamics, quantum chemistry, statistical mechanics and dynamics and enzymology Enzymes are proteins that catalyze chemical reactions. In enzymatic reactions, the molecules at the beginning of the process are called substrates, and the enzyme converts them into different molecules, called the products. Almost all processes in a biological cell need enzymes to occur at significant rates. Since enzymes are selective for their
- activity (chemistry) In chemical thermodynamics activity is a measure of the “effective concentration” of a species in a mixture. By convention, it is a dimensionless quantity. The activity of pure substances in condensed phases (solid or liquids) is normally taken as unity. Activity depends on temperature, pressure and composition of the mixture, among other, 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. An assignment is a task under the responsibility of an assignee which should have a start and end date defined. One or more assignments on a task puts the task under execution. Completion of all assignments on a specific task should claim the
- activity (radioactivity) Radioactive decay is the process in which an unstable atomic nucleus spontaneously loses energy by emitting ionizing particles and radiation. This decay, or loss of energy, results in an atom of one type, called the parent nuclide transforming to an atom of a different type, named the daughter nuclide. For example: a carbon-14 atom emits radiation, the number of radioactive decays per second
- activity (software engineering) Activity diagrams are diagram technique showing workflows of stepwise activities and actions, with support for choice, iteration and concurrency. In the Unified Modeling Language, activity diagrams can be used to describe the business and operational step-by-step workflows of components in a system. An activity diagram shows the overall flow of
- activity (soil mechanics) The Atterberg limits are a basic measure of the nature of a fine-grained soil. Depending on the water content of the soil, it may appear in four states: solid, semi-solid, plastic and liquid. In each state the consistency and behavior of a soil is different and thus so are its engineering properties. Thus, the boundary between each state can be
- activity diagram Activity diagrams are diagram technique showing workflows of stepwise activities and actions, with support for choice, iteration and concurrency. In the Unified Modeling Language, activity diagrams can be used to describe the business and operational step-by-step workflows of components in a system. An activity diagram shows the overall flow of, a diagram representing activities in UML Unified Modeling Language is a standardized general-purpose modeling language in the field of software engineering. The standard is managed, and was created by, the Object Management Group
- Activity, a board game A board game is a game in which counters or pieces that are placed on, removed from, or moved across a "board" . Like other forms of entertainment, board games can represent nearly any subject by Piatnik & Söhne
- HMS Activity (D94), an aircraft carrier of the Royal Navy The Royal Navy of the United Kingdom is the oldest of HM Armed Forces . From the beginning of the 18th century until well into the 20th century, it was the most powerful navy in the world, playing a key part in establishing the British Empire as the dominant world power from 1815 until the early 1940s. In World War II, the Royal Navy operated
- in military parlance, a military agency or unit (e.g. Intelligence Support Activity The United States Army Intelligence Support Activity is a United States Army Special Operations unit originally subordinated to the US Army Intelligence and Security Command (INSCOM). It is tasked to collect actionable intelligence in advance of missions by other US special operations forces, especially Delta Force and DEVGRU in counter-terrorist)
See also
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