definition of convection currents
8e6e13adeb54b7172fab3509cf98e50b
What is the definition of convection currents? Convection currents: a cycle of which heat energy in a liquid rises to the top then becomes dense because it is farther away from the heat source at the bottom. the energy sinks to the bottom then heats up again. the cycle repeats.
5132297b37e52cb648bc26667448a2ce
CONVECTION Convection is the name for a means of heat transfer, as distinguished from conduction and radiation. It is also a term that describes processes affecting the atmosphere, waters, and solid earth. In the atmosphere, hot air rises on convection currents, circulating and creating clouds and winds. Likewise, convection in the hydrosphere circulates water, keeping the temperature gradients of the oceans stable.
5f21aa8e54ee92a79ab38593e1a42c08
- The difference in temperature and density is the cause of convection currents in the earths mantle. Convection currents are the flow that transfers heat within a fluid. Edit
a79bb82babd72a4eb96dda181f377aed
Heat Conduction Heat Convection Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it. Convection above a hot surface occurs because hot air expands, becomes less dense, and rises (see Ideal Gas Law).
d35fee16a0c16912ab4635bffc49a67c
Convection Currents Convection currents 2. As the magma heats, it rises to the upper mantle. As the magma reaches the upper Mantle, it reduces in temperature and begins to become more rigid. Due to this increased weight the magma begins to fall to the lower Mantle.
000ce0fc5b9f15267bc9ef72cde927f3
CONVECTION In the atmosphere, subsidence results from a disturbance in the normal upward flow of convection currents. These currents may act to set up a convective cell, as we have seen, resulting in the flow of breeze. The water vapor in the air may condense as it cools, changing state to a liquid and forming clouds. Convection can create an area of low pressure, accompanied by converging winds, near Earth's surface, a phenomenon known as a cyclone.
b2a474762963b13e153f4c2e58066c6d
convection convection Convection is the circular motion that happens when warmer air or liquid — which has faster moving molecules, making it less dense — rises, while the cooler air or liquid drops down. Convection is a major factor in weather. The sun heats the earth’s surface, then, when cooler air comes into contact with it, the air warms and rises, creating an upward current in the atmosphere. That current can result in wind, clouds, or other weather.
b25c3f78595ec6e9f2b857b6142993c8
Convective heat transfer Familiar examples are the upward flow of air due to a fire or hot object and the circulation of water in a pot that is heated from below. Forced convection: when a fluid is forced to flow over the surface by an internal source such as fans, by stirring, and pumps, creating an artificially induced convection current.
e33da7f1f05212ce785ed89a07b1531e
Convective heat transfer Convection is the transfer of thermal energy from one place to another by the movement of fluids. Although often discussed as a distinct method of heat transfer, convection describes the combined effects of conduction and fluid flow or mass exchange. Two types of convective heat transfer may be distinguished:
ea9e6896ec097afde6b8a2b1352309f9
- Consider a USDA Rural Development Business and Industry Guaranteed Loan. These loans are available to farmers for a variety of purposes in amounts of up to $40 million. The term of the loans vary but generally range between 7 and 30 years.
39c2088e6e73b63b3e1406e3f687f1a2
Earth's Interior/Plate Tectonics Explain how convection currents move the plates. 1. material in the mantle is heatd by the radioactive core; 2. it floats to the surface next to the crust; 3. as it cools, it moves back down towards the core.
daa0d5d26e49d27685d5601a05b416ca
Severe Weather Glossary Convection Generally, transport of heat and moisture by the movement of a fluid. In meteorology, the term is used specifically to describe vertical transport of heat and moisture in the atmosphere, especially by updrafts and downdrafts in an unstable atmosphere. The terms convection and thunderstorms often are used interchangeably, although thunderstorms are only one form of convection. Cbs, towering cumulus clouds, and ACCAS clouds all are visible forms of convection. However, convection is not always made visible by clouds. Convection which occurs without cloud formation is called dry convection, while the visible convection processes referred to above are forms of moist convection.
f0dcbf8fa33efc892d9241df88490868
Convection In the context of heat and mass transfer, the term convection is used to refer to the sum of advective and diffusive transfer. In common use the term convection may refer loosely to heat transfer by convection, as opposed to mass transfer by convection, or the convection process in general.
2d81ce6c1fbe527622cd23e2b4fe1f63
alternating current [kur´ent] 1. something that flows. 2. specifically, electricity transmitted through a circuit. alternating current a current that periodically flows in opposite directions; its amplitude fluctuates as a sine wave. convection current a current caused by movement by convection of warmer fluid into an area of cooler fluid.
b3e8bbb5daeb91dac009e0f25da5c311
Density Creates Currents As the air cools, it becomes more dense, sinks to the floor, and eventually completes a circuit of the room. A circular convection current is set up. Circular currents like this are called convection cells. Convection currents like this also take place in the atmosphere (see the picture below). A convection cell can also occur in the atmosphere.
318902e3afb713dfe83f2141a94bd3ea
Contents Abuse. Ketamine is manufactured commercially as a powder or liquid. Users sometimes evaporate liquid ketamine on hot plates, on warming trays, or in microwave ovens, a process that results in the formation of crystals, which are then ground into powder.owdered ketamine is cut into lines known as bumps and snorted, or it is smoked--typically in marijuana or tobacco cigarettes. Liquid ketamine is injected or ingested after being mixed into drinks.
bf99a94ff47abb8e6571d96ad4ae42fb
CONVECTION • CONVECTION (noun). The noun CONVECTION has 2 senses: 1. the transfer of heat through a fluid (liquid or gas) caused by molecular motion. 2. (meteorology) the vertical movement of heat or other properties by massive motion within the atmosphere. Familiarity information: CONVECTION used as a noun is rare. Dictionary entry details. • CONVECTION (noun).
9317f6ea79fa1377fbcc4606b30fc8c3
- 3. Convection. Convection is the transfer of heat by the movement of a heated fluid. During convection, heated particles of a fluid begin to flow, transferring heat energy from one part of the fluid to another. Convection currents continue as long as heat is added to the fluid.
e48eee65daaab213c9f0d1f94cc7338c
What are Convection Currents? - Definition & Examples This lesson will define convection, explain how it works, and describe how convection creates currents. We will also go through some examples of convection in the world around us: campfires, weather systems and convection in the Earth's mantle.
c0a82db4013ab78bdf6c6eb6f9dcec4c
- The particles in fluids (liquids or gases) can move from place to place when heated. Convection occurs when particles with a lot of heat energy move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection. Click here for an example of convection currents in a gas. Click here for an example of convection currents in a liquid.
4572f357a430c042c3458d9b40378213
Atmospheric Processes â Convection The continual cycling of the fluid is called a convection current. Convection currents are found in many places and on many scales, from huge convection currents in the atmosphere, oceans, and even in the earth's interior to smaller convection currents found in a cup of hot cocoa or a fish tank.eat moves in fluids through several processes, including convection. Convection is the transfer of heat by the actual movement of the heated material. Any substance that flows is considered a fluid. This includes such things as water, shampoo, sunscreen, and even honey.
a18aa7f2b2b76f2c50213f84d3cd3d3e
What causes convection currents in the earths mantle? Convection currents are caused by the inner core, which is the  Inner layer of the Earth.    Convection currents begin due to the extreme heat of the inner  core.The … inner core heats up the very bottom of the mantle. The  heated up substances within the mantle has a higher temperature  than those higher in the mantle and closer to the surface of the  earth.onvection currents are caused by the inner core, which is the  Inner layer of the Earth.    Convection currents begin due to the extreme heat of the inner  core.
9bf31c201688adc8682fe2e87aee5ca9
Mantle convection Mantle convection is the slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior of the Earth to the surface. The Earth's surface lithosphere, which rides atop the asthenosphere (the two components of the upper mantle), is divided into a number of plates that are continuously being created and consumed at their opposite plate boundaries.
b7ff8b0a5fdb13eefaf7d53def6e30f9
Chapter 5 Plate Tectonics Section 2 Convection and the Mantle Describe how convection currents form. Convection Currents forms by the heating and cooling of the fluid, changes in the fluid's density, and the force of gravity combine to set the convection currents in motion.
4dc69f72000645ed3e1b9ae366f4be99
Mantle convection Mantle convection is the slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior of the Earth to the surface.[3][4] The Earth's surface lithosphere, which rides atop the asthenosphere (the two components of the upper mantle), is divided into a number of plates that are continuously being ...
e5d38f9726666c1c262f258158e8bdfc
How convection currents form? Convection currents form due to an increase in temperature in an  enclosed space in which a fluid is located as warmer fluid moves to  the top and cooler fluid moves to the … bottom.