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Convection occurs when heat is transferred through the movement of a fluid, such as air or water. The fluid near a heat source becomes warmer, causing it to expand and become less dense, allowing it to rise. Cooler fluid then moves in to take its place, creating a continuous cycle of heat transfer.
A difference in temperature.
Higher temperatures cause higher pressures and lower density. Another region where the temperature and pressure are lower, and density higher will naturally go to the region with the higher temperature. It's a difference in gradients which causes this movement of a mass of air or any other fluid.
Particles are heated up and lose their density. Lighter/ less denser partcles move upwards and the heavier ones come down until they lose their density too. The same process goes on and on until the particles have all lost their density and heat is gained...
Water boiling in a pan.
The heat transferred through the bottom of the pan to the cooler waters at the bottom of the pan heat those waters, they now are less dense relative to the water at the top of the pan due to their higher heat, they rise to the surface, forcing the cooler water to the bottom.
In most fluids (either a liquid or a gas) if you increase the temperature it will make them expand, swell up, so that they become less dense. When they are less dense they float upwards more easily. If you cool them it makes them denser, so that they sink more easily. Whichever way they go, they take their extra heat, or lack of heat, with them. Heat can also travel by conduction, hotter atoms bumping into cooler atoms, which passes on their heat, but conduction is only fast over very small distances. Over long distances it is enormously slow. Convection can carry heat as fast as the fluid can move, which sometimes can be very fast. For instance, even our strongest winds, including tornadoes and hurricanes, are caused by convection in one way or another.
If convection is caused by a high temperature in a small spot, such as at the flame of a candle, then the hot gas can go straight up immediately, pushing cooler gas, such as air, aside, and the cool air flows down into the space left by the hot air that flowed up.
If convection is caused by a high temperature over a large area, such as when the sun has heated a black pavement, maybe kilometres across, then the hot air at the bottom cannot easily go up because the cool air above it is in the way and the cool air cannot go down because along any part it might follow, there will be hot air below. It is as though you had traffic trying to go two ways along a crowded road and they were not following separate lanes. You would simply get a huge traffic jam. Sooner or later, some little bits of air will float up a little or sink down a little, and as soon as some such movements starts the convection starts and it all goes faster and faster. The flowing up or flowing down may become very much like the water flowing down the drain of a bath, forming a whirlpool. That is how tornadoes start.
Even when we don't have such a traffic jam in the air, but there is a big mass of cold air next to a big mass of hot air, then the way convection works is that the cold air sinks down and flows sideways under the hot air. That flow is a cold wind of the kind we get at what people call a cold front. It also can be a very strong wind.
Convection takes place when cool air is warmed, which then rises. As the warm air becomes cool, it sinks. It is this cycle of warm and cool circulating air that transfer the heat (from a radiator, for instance) by convection, and warms a room.
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Thermal transfer by convection takes place in materials that are?
Thermal transfer by convection takes place in materials that are fluids or gases. In this process, heat is transferred through the movement of the material itself, creating a circulation pattern that transfers heat energy. Convection is a key mechanism for heat transfer in liquids and gases.
What method of heat transfer takes place in the movement of fluids?
Convection is the method of heat transfer that takes place in the movement of fluids. In convection, heat is transferred through the movement of a fluid (liquid or gas) due to density differences caused by temperature variations. This process helps distribute heat more efficiently in fluids such as water or air.
The transfer of heat that takes place because of density difference in fluids is?
The transfer of heat that takes place due to density differences in fluids is called natural convection. In this process, the warmer, less dense fluid rises while the cooler, denser fluid sinks, creating a circulating flow that helps transfer heat throughout the fluid.
What are the three types if heat transfer?
The three most common types of heat transfer are convection, radiation, and conduction. Convection is the movement of heat through a liquid. Radiation is the movement of heat from a distance like the sun warms the earth and a fire warms things that are near. Conduction is the transfer of heat through touch like when you touch a hot pan, stove, etc.
How heat travels through convection?
Heat travels through convection by the movement of fluid molecules, which carry thermal energy from one place to another. As a fluid is heated, its molecules become less dense and rise, creating a convection current that transfers heat. This process continues as the heated fluid moves away and cooler fluid takes its place, establishing a cycle of heat transfer.
Can convection takes place in vacuum?
No
Why does convection take place?
Convection takes place because cool air is less dense than warm air.
Which layer of the earth does convection take place in?
Convection takes place in the Earth's mantle, which is the layer of hot, semi-solid rock located between the crust and the outer core. Heat from the Earth's core drives convection currents in the mantle, causing the movement of tectonic plates.
The type of thermal energy transfer that takes place in fluids is mostly?
Mode of energy transfer in fluids is convection.
Heat transfer that takes place as a result of currents in liquids and gases is called?
Convection
What is the two layers below earths surface in which convection takes place?
The two layers below Earth's surface where convection takes place are the mantle and the outer core. In the mantle, convection currents are responsible for plate tectonics and the movement of Earth's lithosphere. In the outer core, convection currents drive the movement of molten iron that generates Earth's magnetic field.
Thermal transfer by convection takes place in materials that are?
Thermal transfer by convection takes place in materials that are fluids or gases. In this process, heat is transferred through the movement of the material itself, creating a circulation pattern that transfers heat energy. Convection is a key mechanism for heat transfer in liquids and gases.
Is the convection layer the middle layer of the sun where nuclear fusion takes place?
The Sun's fusion takes place in the core. The Convective zone brings heat to the surface by thermal convection, which is basically hot plasma coming up to the surface, then cooling and sinking.
What are the two layers of the earth in which convection takes place?
Mantle is one, and I'm gonna guess core.
What method of heat transfer takes place in the movement of fluids?
Convection is the method of heat transfer that takes place in the movement of fluids. In convection, heat is transferred through the movement of a fluid (liquid or gas) due to density differences caused by temperature variations. This process helps distribute heat more efficiently in fluids such as water or air.
What are two layers of earth in which convection currents takes place?
dont known tell me
What are the two layers of earth in which convection current takes place?
Mantle is one, and I'm gonna guess core.
