what is convection current?

Answer 1

A current in any fluid, caused by a temperature difference, which transports heat such as to reduce that difference. The oven in most kitchen ranges works by convection: a gas or electric heater at the bottom heats the air, which rises to heat the food.

Answer 2

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

Answer 3

Convection currents are ways that fluids can equilibriate heat by moving and flowing. Hot material rises, cool material sinks.

Answer 4

A convection current can be a current (flow) of air, water, or any other fluid. Basically, it is the vertical (up and down) movement of the fluid. for example, in the case of air, hot air is lighter than cool air. So when hot and cool masses of air meet, the warmer mass of air rises abouve the cooler mass. Sometimes, it rises up to such a great height that it becomes cooler than the other mass of air, and so it sinks down. When it sinks down, the earth warms it up and it rises up again... This cycle continues and thus, a convection current (vertical movement) of air is formed.

Answer 5

Convection current:
A circular current in a fluid like air, water, or molten rock. The process occurs when the fluid is unevenly heated so that part of the fluid rises, cools, and then sinks producing the circular movement.

Answer 6

The previous answers all touch the circle of the answer-practically speaking convection current is what keeps a bird aloft when you witness their wings spread,but not "flapping"--they are catching a convection-also known as thermal current-caused by many differences on the earth's surface, for one. "Gliders"
also use this principle to
stay in the air--as we all should know-"heat" rises,while "cold" falls--also how tornadoes & windstorms form, they "roll" with convection until they accelerate like a top and gain enough speed to go vertical.

Answer 7

Convection Current isthe transfer of heat by the mass movement of heated particles.

Answer 8

you mean convectional current about which what I know yet is
that it flows from positive terminal to negative terminal .This point will become more clear
when electricity was invented a long time back,it was known that there are two types of charges:+ve charge&-ve charge but electron had not been discovered at that time.So electric current was considered to be a flow of positive charges & the direction of +ve charges was taken to be the direction of electric current

Answer 9

Convection is the transfer of potential energy, for example heat, by currents within liquids and gases.


http://en.wikipedia.org/wiki/Convection

Answer 10

The flow of electricity[electrons] takes place in three ways.
conduction current through solid conductors[mostly metals].
convection current through fluids[liquids and gases].
and displacement current through insulators[just like in capacitors].
so convection current flows through fluids by ionising the medium/carrier of electricity