A current, in a river or stream, is the flow of water influenced by gravity as the water moves downhill to reduce its potential energy. The current varies spatially as well as temporally within the stream, dependent upon the flow volume of water, stream gradient, and channel geometrics. In tidal zones, the current in rivers and streams may reverse on the flood tide before resuming on the ebb tide. For other uses, see River (disambiguation). ... Butchers Creek, Omeo, Victoria A stream, brook, beck, burn or creek, is a body of water with a detectable current, confined within a bed and banks. ... Look up flow in Wiktionary, the free dictionary. ... Impact from a water drop causes an upward rebound jet surrounded by circular capillary waves. ... Gravity is a force of attraction that acts between bodies that have mass. ... The downhill is an alpine skiing discipline. ... Potential energy can be thought of as energy stored within a physical system. ... The word space has many meanings, including: Physics The definition of space in physics is contentious. ... For alternate uses of time, see Time (disambiguation) or see TIME (magazine). ... For other uses, see Volume (disambiguation). ... Stream gradient is the ratio of drop in a stream per unit distance, usually expressed as feet per mile or meters per kilometer. ... A rock, seen at low tide, exhibiting typical intertidal zonation. ... Categories: Possible copyright violations ... Ebb Tide is a popular song, written in 1953 by lyricist Carl Sigman and musicwriter Robert Maxwell. ...

Air currents may be caused by differences in temperature, pressure, or impurity concentration. Temperature differences can cause air currents because warmer air is less dense than cooler air, causing the warmer air to appear "lighter." Thus, if the warm air is under the cool air, air currents will form as they exchange places. Pressure differences also cause air currents as the air flows from areas of higher pressure to areas of lower pressure. Impurities cause air currents due to entropy, which is the natural tendency of a system to move to a disordered state. For example, if perfume is sprayed in the corner of a closed room, it will eventually disperse evenly to the entire room. A current is the rate of fluid flow, especially water or air. ... For other uses, see Temperature (disambiguation). ... Air pressure can refer to: Atmospheric pressure, the pressure of air environmentally Pressure of air in a system Category: ... Impurities are substances inside a confined amount of liquid, gas, or solid, which differ from the chemical composition of the material or compound. ... For other uses, see Density (disambiguation). ... For other uses, see Perfume (disambiguation). ...

See also

• Ocean current
• Rheotaxis
• Volumetric flow rate
• Electric current

Ocean currents (1911) Ocean currents (1943) An ocean current is any more or less continuous, directed movement of ocean water that flows in one of the Earths oceans. ... (Positive) Rheotaxis is a behavior in fish whereby they will (generally) turn to face into an oncoming current. ... In fluid dynamics, the volumetric flow rate, also volume flow rate and rate of fluid flow, is the volume of fluid which passes through a given volume per unit time (for example gallons per minute or squeaks per parsec). ... This box:      Electric current is the flow (movement) of electric charge. ...

External links

• Current in a pipe (animation)