In convection, heat is carried from one place to another by the bodily transfer of the matter containing it. In particular, this is the method by which heat raises the temperature of a fluid mass. That part in close contact with the heating agent expands and rises, moving away from it, while colder fluid moves in to take its place. This action in the atmosphere gives rise to convectional currents which may produce cumulus or cumulonimbus cloud.
(HVAC) Process of heat carried from one point to another by movement of liquid or a gas (i.e. air). Natural convection is caused by expansion of the liquid or gas when heated. Expansion reduces the density of the medium, causing it to rise above the cooler, more dense portions of the medium. Gravity heating systems are examples of the use of natural convection. The air, heated by the furnace, becomes less dense (lighter) and rises, distributing heat to various areas of the house without any type of blower. When a blower is used, the heat transfer is called "forced convection".
another sobering physics lesson: the circulation of cold air in exchange for warm, which happens when you're without a windproof shell in blustery conditions. The body will continuously attempt to heat the frigid air, causing you to become cold.
Rising air currents due to heating as sunlight warms the ground and the lower atmosphere. Warm air rises because it is less dense after it expands. Convection is the process that leads to the formation of thunderstorms.
The motion of a liquid driven by gravity and temperature differences in the material. In the Earth, where pressure and temperature are high, rocks can act like viscous fluids on a time scale of millions of years. Thus, scientists believe that convection is an important process in the rocks that make up the Earth.
The transmission of heat by the circulation of a liquid or gas. It may be natural, with the circulation caused by buoyancy affects due to temperature differences, or forced with circulation caused by a mechanical device such as a fan or pump.
Rotational flow of a fluid resulting from imbalances in density. This often occurs because the fluid below is heated and becomes less dense than the fluid above or because the fluid above is cooled and becomes more dense than the fluid below.
The rising of warm air and the sinking of cool air. Heat mixes and moves air. When a layer of air receives enough heat from the Earth's surface, it expands and moves upward. Colder, heavier air flows under it which is then warmed, expands, and rises. The warm rising air cools as it reaches higher, cooler regions of the atmosphere and begins to sink. Convection causes local breezes.
the act of a fluid, such as air or water, coming in contact with an object that is at a higher temperature. This contact causes convection currents to form as fluid of higher temperature moves to areas of cooler temperature.
The mass motion within a fluid, resulting in the transport and mixing of the properties of that fluid. This could be the transport of heat and/or moisture. It is often used to imply only upward vertical motion and then it is the opposite of subsidence.
The organized flow of large groups of molecules based on their relative densities or temperatures. A hot fluid or gas will move upward, and a cooler liquid or gas will sink downward.. ( go to first use in the text)
Advection is transport by mass flow of a medium; for example, water. Convection describes bulk water transport (i.e., flux) through porous media. Diffusion is the net transport of solutes within the liquid, solid or gas phase resulting from random (Brownian) motion of individual molecules in response to a concentration or other gradient.
the transfer of heat by a large-scale displacement of groups of molecules with relatively higher kinetic energy. Molecules with higher kinetic energy are moved from one place to another. The heat rises and the cold moves under in a circular pattern. Coordination Compound or Complex: a compound containing coordinate covalent bonds
A meteorological term meaning a rapid upward movement of air that occurs through the strong heating of the Earth’s surface and supportive atmosphere instability. Winds and currents are mainly driven by convection in the atmosphere and in the oceans
The mechanism for transfer of heat from a solid surface (such as a component) to a surrounding fluid (usually air). Natural convection is heat transfer to â€˜stillâ€™ air; forced convection involves heat transfer to air that is moved by artificial means such as a fan.
A METHOD BY WHICH HEAT IS TRANSFERRED WHERE THERE IS A DIFFERENCE IN THE DENSITY OF THE AIR GAP BETWEEN THE SHEETS OF GLASS IN AN INSULATED GLASS UNIT AND WHERE GRAVITY INTERACTS WITH IT. THIS SAME EFFECT ALSO AFFECTS HEAT TRANSFER FROM THE GLASS SURFACE TO THE AIR IN THE ROOM.
Describes the vertical air motion that occur when the atmosphere is unstable. Convection often gives rise to the formation of convective cloud (Cumulus, Towering Cumulus and Thunderclouds) and showery precipitation.
The transfer of heat through a moving gas (air) and a surface, or the transfer of heat from one point to another within a gas. In hydronic heating, cool air falls to the floor where it is heated by metal fins in a baseboard radiator and then rises to transfer heat to the environment through natural convection.
The transport of energy by fluid motions occurring in gases, in liquids, or in semi rigid material such as the earth's mantle. These motions are usually driven by the buoyancy of heated material, which tends to rise while cooler material descends. A to F | G to L | M to R | S to Z
One of the three possible modes of heat transfer (the others are conduction and radiation), this refers to heat transfer when a moving fluid (can be liquid or gas) is present; the heat is transferred by the bulk motion of the fluid.
atmospheric motions that are predominantly vertical, such as rising air currents produced by surface heating. Forced convection happens when air is forced to rise by something, such as an advancing cold front or mountains. Free convection is the rising of heated air and the sinking of cooler air without the need of external forces.
The transfer of heat by the movement of heated liquid or gas. Vertical rising of heat energy (heat convection) in the atmosphere occurs when a shallow layer of air in contact with a hot surface warms up, becomes more buoyant (warmer air is less dense than colder air), and rises, taking with it the energy that it has stored.
A PROCESS WHEREBY AIR BECOMES BUOYANT RELATIVE TO ITS SURROUNDINGS AND BEGINS TO RISE IN A CONCENTRATED COLUMN - WHILE THE SURROUNDINGS SUBSIDE OVER A MUCH LARGER AREA. THE TERM IS OFTEN USED TO DESCRIBE THE OCCURENCE OF DEEP CUMULUS CONVECTION IN THE TROPICAL OCEANS.
the upward motion of a mass of air that has been heated. Convection is the primary way that heat is transferred in the atmosphere. It is the process by which warm air rises up from the ground, to be replaced by cold air. The cold air is then warmed and cycles upward.
Motion in a fluid or plastic material due to some parts being buoyant because of their higher temperature. Convection is a means of transferring heat through mass flow rather than through simple thermal conduction.
A self-starting circulation in a fluid (such as air or water), where a warm current rises into a cool area, and a cool current descends to take its place. Convection is driven by gravity -- warm fluids are usually lighter than denser cold fluids, and gravity drags the densest material to the bottom.
Heat transfer through the atmosphere by a difference in force or air pressure is one type of air transport. Sometimes referred to as the "stack effect," hotter less dense air will rise, colder dense air will fall creating movement of air within a building.
transfer of heat through a liquid or gas by the actual movement of the liquid or gas; associated with large-scale, vertical movements within the atmosphere, or movement and mixing of water masses in the ocean, or vertical and lateral movements of a subcrustal material in the earth's mantle.
the transfer of heat to or from a solid surface via a gas or liquid current. Where home heat loss and gain are concerned, heat convection is caused by air (gas) currents that carry heat from your body, furniture, interior walls and other warm objects to windows, floors, ceilings, exterior walls and other cool surfaces. Energy Services Energy Systems/Technologies
The transfer of heat by the physical movement of molecules from one place to another. Hot air rises and heated water thermosiphons. Through convection a tank of water heated from a single source will advance towards reaching an even temperature throughout its mass.
A transfer of heat that occurs when a fluid flows inside a channel of a different temperature; heat is transferred through the fluid because of the difference in motion between it and the flow boundary.
Convection is the transfer of heat in fluid or air, caused by the movement of the heated air or fluid itself. In a building space, warm air rises and cold air settles to create a convection loop and is termed free convection. Convection can also be caused mechanically by a fan and is termed forced convection.
transfer of energy and mass by motions in a liquid or gas. In the atmosphere, convection usually refers to the vertical interchange of air masses. An example of convection is the rising of warm surface air and the sinking of cold air from upper levels of the atmosphere.
The transfer of heat by the movement of a gas or liquid; convection, conduction, and radiation are the principal means of energy transfer. As specialized in meteorology, atmospheric motions that are predominantly vertical in the absence of wind (which distinguishes this process from advection), resulting in vertical transport and mixing of atmospheric properties.
Heat transfer between two objects, one of which is either a liquid or a gas. During convection, the pull of gravity initiates fluid circulation, causing heated molecules to rise and cool molecules to fall.
A circulating flow in a fluid, carrying heat away from its source. Convection in the atmosphere carries heat from the sun-warmed ground to higher layers, where it is radiated away into space; the lower levels do not radiate efficiently because of the greenhouse effect. Atmospheric convection is the engine that drives the Earth's weather. Convection is also believed to occur in a certain depth range below the Sun's surface, helping carry away heat from the Sun's core region.
Motions in a fluid that transport and mix the properties of the fluid. These properties could be heat and/or moisture. When used to imply only upward vertical motion, it is then the opposite of subsidence.
Heat transfer from a solid into a liquid or gas. The energy transferred through the heat sink leaves via convection to air or water. Convection increases with increasing temperature differential, increasing surface area, and increasing convection coefficient.
In meteorology, this term is used most often to describe the vertical transport of heat and moisture, especially by updrafts and downdrafts in unstable air. Showers and thunderstorms are forms of convection.
in general, the transport and mixing of the properties of a fluid (e.g., heat, moisture, etc.) by means of mass motion within the fluid; in meteorology, atmospheric motions generally are divided into those in the horizontal, or advection, and those in the vertical, or convection; convection typically results from surface heating and the subsequent rising of warm air
1. The circulatory motion that occurs in a fluid at a non-uniform temperature owing to the variation of its density and the action of gravity. 2. The transfer of heat by this automatic circulation of fluid.
It is the transfer of heat by the substance moving en bloc. Heated substance (gas or liquid) loses density and therefore rises (moves) to cooler region in the substance. Heated substance looses density, therefore moves from hot region to cooler region and colder substance (with higher density) move to towards the source of heat. Hence a convection current is set up.
A heat transfer process involving motion in a fluid (such as air) caused by the difference in density of the fluid and the action of gravity. Convection affects heat transfer from the glass surface to room air, and between two panes of glass.
The transfer of heat from one point to another in a fluid by mixing one portion of the fluid with another. Natural convection is caused by density variations due to temperature differences. Forced convection is the motion produced by mechanical means.
The physical up-welling of hot matter, thus transporting energy from a lower, hotter region to a higher, cooler region. A bubble of gas that is hotter than its surroundings expands and rises. When it has cooled by passing on its extra heat to its surroundings, the bubble sinks again. Convection can occur when there is a substantial decrease in temperature with height, such as in the Sun's convection zone.
Process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions sink. This is also a a component of the theory for continental drift, in that the circulating movements of crustal materials push the continents apart. [Journal of the Atmospheric Sciences. v 46, 1540, 1989.] [Journal of the Atmospheric Sciences. v 45, 2641, 1988.
Convection is the transfer of heat by the circulation or movement of heated parts in a liquid or gas. Convection is also the circulatory motion that occurs in a fluid which is at a nonuniform (or varying) temperature caused by the variation of the density of liquid at different temperatures and the action of gravity.
A transfer of heat within a fluid by fluid motions. Meteorologists refer to vertical motions as convective. Horizontal motions are advective. Also used to denote the presence of cumulus clouds (also known as convective clouds); most often refers to instability.
The transfer of heat energy by air or fluid movement. This motion is a spontaneous circulation due to the combined actions of gravity and changes in air or fluid density. In space heating, the operation of a baseboard heater is a good example of convection.
The transfer of heat or mass by large-scale fluid movements. When the process occurs, due to density and temperature differences, it is termed natural convection. When the process occurs due to external devices (such as fans), it is termed forced 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, especially by updrafts and downdrafts in an unstable atmosphere. 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.
Atmospheric motions in the vertical direction resulting from surface heating and the subsequent rising of warm air. This lifting mechanism is capable of generating the rising motions necessary for clouds and precipitation to form.
The movement of matter due to changes in temperature and therefore density. Warm material rises because it is less dense (lighter) and cool material sinks because it is more dense (heavier). Image of Granules. These features are the tops of convection cells on the Sun where hot fluid rises up from the interior in the bright areas, spreads out across the surface, cools and then sinks inward along the dark lanes. Individual granules last for only about 20 minutes. Each granule is about the size of Texas. Image from the Swedish Vacuum Solar Telescope.
Convection is the internal movement of currents within fluids (i.e. liquids and gases). It cannot occur in solids due to the particles not being able to flow freely. The most common cause of internal movement is a variation in density due to a transfer of heat.