0
The current in the fluid is the result of a difference in temperature at different depths.
It's called convection, and it does the transferring of heat from the bottom to the top
of the fluid.
What sets up the convection currents is whatever it was that added heat to the
bottom of it. That could have been conduction, radiation, or a chemical process.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
What are the circumstances under which convection can occur in a substance?
One would need a fluid (water, air or the like) and something to drive currents within it. Here's the skinny right from our friends at Wikipedia: "Convection in the most general terms refers to the movement of currents within fluids (i.e. liquids, gases, and rheids)." Jumping off from there, let's look at an example of a heat transfer possibility. When we use the oven, the kitchen gets warm. There is a bit of thermal radiation, but skip that and just check the convection side. Air (a fluid) is against the outside of the oven door. As heat from the door is transferred to the air, it becomes less dense than the air around it, and it rises. Some "new" cooler air takes its place and the process continues. A convection current has spontaneously arisen. The process of heat transfer drives the convection cycle; it sets up those currents in the air around the oven. Soon the kitchen is warmer than it used to be.
What is a convection current current?
Convection currents are vertical movements of fluids driven by heat. Hot fluids rise because they are less dense than cold fluids which sink. The best example would be soup boiling - stuff in the soup comes to the surface over the flame and sinks back towards the edges of the pot. --------------------------------------------------------------------------------------- Current caused by the expansion of a liquid, solid, or gas as its temperature rises. The expanded material, being less dense, rises, while colder, denser material sinks. Material of neutral buoyancy moves laterally. Convection currents arise in the atmosphere above warm land masses or seas, giving rise to sea breezes and land breezes, respectively. In some heating systems, convection currents are used to carry hot water upwards in pipes. Convection currents in the hot, solid rock of the Earth's mantle help to drive the movement of the rigid plates making up the Earth's surface.
What causes thermal convection in the mantle?
Convection is a type of heat transfer that is driven by the flow of liquid, or by a solid or weak material. These convection cells that flows in a circular direction are caused by the initial heating of earth's core. Earth is hot due to the original formation, and what keeps the heat circulating is radioactive decay. As unstable elements decay, they release energy and heat, which promotes convection cells in earth's mantle.
What tends to be more dense and flow under warm air?
the presision of heat and the sun sets charge lol not true
When was Rigor Mortis Sets In created?
Rigor Mortis Sets In was created in 1972-11.
What are the types of heat flow and how do they differ?
Conduction (The transfer of heat from one substance to another by direct contact.) Convection (A technical way of saying that heat rises and this sets up air currents.) Radiation (Radiation describes any process in which energy travels through a medium or through space, ultimately to be absorbed by another body.)
What are the circumstances under which convection can occur in a substance?
One would need a fluid (water, air or the like) and something to drive currents within it. Here's the skinny right from our friends at Wikipedia: "Convection in the most general terms refers to the movement of currents within fluids (i.e. liquids, gases, and rheids)." Jumping off from there, let's look at an example of a heat transfer possibility. When we use the oven, the kitchen gets warm. There is a bit of thermal radiation, but skip that and just check the convection side. Air (a fluid) is against the outside of the oven door. As heat from the door is transferred to the air, it becomes less dense than the air around it, and it rises. Some "new" cooler air takes its place and the process continues. A convection current has spontaneously arisen. The process of heat transfer drives the convection cycle; it sets up those currents in the air around the oven. Soon the kitchen is warmer than it used to be.
What one process sets the energy in the transfer atmosphere in motion?
Atmospheric circulation sets the energy in the transfer atmosphere in motion
What sets convection currents into motion?
If you are heating water in a pan on the stove, the water at the bottom of the pan will warm first. Since warm water is lighter, it will rise, and cool water from the top will flow down to replace it. This is called convection, and will continue until all the water is hot. Convection currents can occur in large bodies of water, in the atmosphere, or beneath the earth's crust. All that is needed is a warmer, lighter fluid below a cooler, heavier one.
What is a convection current current?
Convection currents are vertical movements of fluids driven by heat. Hot fluids rise because they are less dense than cold fluids which sink. The best example would be soup boiling - stuff in the soup comes to the surface over the flame and sinks back towards the edges of the pot. --------------------------------------------------------------------------------------- Current caused by the expansion of a liquid, solid, or gas as its temperature rises. The expanded material, being less dense, rises, while colder, denser material sinks. Material of neutral buoyancy moves laterally. Convection currents arise in the atmosphere above warm land masses or seas, giving rise to sea breezes and land breezes, respectively. In some heating systems, convection currents are used to carry hot water upwards in pipes. Convection currents in the hot, solid rock of the Earth's mantle help to drive the movement of the rigid plates making up the Earth's surface.
Why do you heat hair curlers?
The heat sort of "sets" your hair in the shape your curlers make it
How is heat transferred into fluids?
When a fluid (liquid or gas) is heated, it expands. The heated fluid is therefore less dense than the fluid around it, so it rises.Colder fluid then sinks down to replace it and this sets up a movement of fluid called a CONVECTION CURRENT.
What are transfer tubings or sets used for?
to move a large amount of fluid into another container
What causes thermal convection in the mantle?
Convection is a type of heat transfer that is driven by the flow of liquid, or by a solid or weak material. These convection cells that flows in a circular direction are caused by the initial heating of earth's core. Earth is hot due to the original formation, and what keeps the heat circulating is radioactive decay. As unstable elements decay, they release energy and heat, which promotes convection cells in earth's mantle.
Why do cookies become tough?
The sugar turns to caramel with the heat of the oven - this sets hard on cooling.
What is an explanation of how thermal energy transferred?
Thermal energy can be transferred from one body, usually hotter, to a second body, usually colder, in three ways: Thermal conduction, convection, and radiation.1. Thermal conduction: Transfer of heat energy resulting from differences in temperature between adjacent bodies or adjacent parts of a body.In the absence of a heat pump, the energy will flow from a region of higher temperature to a region of lower temperature. The transfer of energy occurs as a result of collision among the particles of the matter involved. The rate of transfer of energy is proportional to the cross-sectional area of contact and to the difference in temperature between the two regions. A substance of high thermal conductivity, such as copper, is a good thermal conductor; one with low thermal conductivity, such as wood, is a poor thermal conductor.2. Convection: Process by which heat is transferred by movement of a heated fluid such as air or water.Most fluids expand when heated. They become less dense and more buoyant, and so rise. The heated molecules eventually cool, become more dense, and sink. This repeated process sets up convection currents that account for the uniform heating of the air in a room or water in a kettle. Air convection can be forced by a fan, and water convection by a pump. Atmospheric convection currents can be set up by local heating effects such as solar radiation or contact with cold surfaces. Such currents are usually vertical and account for atmospheric phenomena such as clouds and thunderstorms.3. Radiation: Process by which energy is emitted from a source and propagated through the surrounding medium, or the energy involved in this process.Radiation consists of a flow of atomic or subatomic particles or of waves.Thermal or heat energy can be transferred in three ways.1. Conduction, when 2 objects are touching.2. Convection, which is the movement of molecules in a fluid.3. Radiation, electromagnetic radiation like infra red.If it is a solid to another it is by conduction. If it is a liquid or a gas to another it is by convection. If it is by light then it is by radiation (e.g. the sun's rays and heat)
Where is the bonnet on a central heat gas furnace?
It sets on top of the fire box and the plenum set on top of that
