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Answer 1. No.
A convection cell is only formed when warmer fluid rises (while colder fluid descends). It cannot do that when it's already at the surface.
Answer 2. Yes.
This happens every year in every medium size lake in the temperate zone of the Earth.
It is called "lake turnover."
When ice melts on a lake and it begins to warm, the temperature increases from 0 C to 4 C and at 4 C water has its maximum density. The warm dense water at the top sinks, moving the colder deep water to the top. The process puts oxygen at the bottom and brings nutrients to the surface.
It is not a continuous cell, but it could be made into one if the lower boundary were kept near 0 C.
What else can I help you with?
What currents are formed when liquids and gases are heated?
When liquids and gases are heated, convection currents are formed. With liquids, the heated fluid rises, cools down and then sinks back, causing a circular motion. In gases, warm air or gas rises and cooler air or gas sinks, creating vertical movements.
What activates a convection current starting a flow of fluid?
What activates a convection current, starting the flow of a fluid? A. cold temperatures at the north pole B. heated liquids at the earth's surface C. iron-rich rocks in the mantle D. temperature differences in the mantle
What is the transfer of thermal energy by the movement of a fluid?
Convection
What will happens to convection currents when liquid or gas is no longer heated?
When a liquid or gas is no longer heated, the heat source that drives convection currents is removed. As a result, the temperature differential that causes the fluid to circulate diminishes, and eventually the convection currents will slow down and stop as the fluid reaches thermal equilibrium.
How do particles behave when boiling?
There is a scientific explanation to why convection, and convection currents occur. Firstly, when the fluid is heated, the particles vibrate more and move further away from each other, decreasing the density of the fluid. This lighter fluid then rises above the denser fluid. While it is rising, the newly heated fluid cools, and this makes the particles oscillate less, making them closer together, and increasing the density of that part of the fluid, making it sink. This cycle is repeated to create a convection current
Why doesnt convection occur when a beaker is heated at the top?
Convection occurs when heated fluid rises and cooler fluid sinks, creating a continuous circulation. If a beaker is heated at the top, the heated fluid near the top would rise but due to cooler fluid at the bottom, the circulation does not sustain itself, thus preventing convection from occurring.
Heat transfer by the movement of a heated fluid is called?
It is called Convection.
How does convection current occur when part of a fluid is heated?
When part of a fluid is heated, it becomes less dense and rises, creating a convection current. As it rises, it displaces cooler, denser fluid, which then descends to replace the rising fluid. This continuous circulation results in a convection current within the fluid.
What is the transfer of energy by the motion of heated particles in fluid?
Convection.
What is the transfer of heat through the movement of heated fluid under the earth surface called?
The transfer of heat through the movement of heated fluid under the Earth's surface is called convection. This process plays a key role in the movement of tectonic plates and the generation of geothermal energy.
How a convection current formed in the beaker?
A convection current in a beaker is formed when the temperature gradient causes fluid to heat up, become less dense, and rise. As the fluid rises, it cools down, becomes denser, and falls back down to be heated up again. This continuous cycle of rising and falling creates the convection current in the beaker.
What is the word Transfer of thermal energy when particles in a heated fluid rise?
Convection.
What currents are formed when liquids and gases are heated?
When liquids and gases are heated, convection currents are formed. With liquids, the heated fluid rises, cools down and then sinks back, causing a circular motion. In gases, warm air or gas rises and cooler air or gas sinks, creating vertical movements.
What activates a convection current starting a flow of fluid?
What activates a convection current, starting the flow of a fluid? A. cold temperatures at the north pole B. heated liquids at the earth's surface C. iron-rich rocks in the mantle D. temperature differences in the mantle
The transfer of a heated fluid is called?
The transfer of a heated fluid is called convection. This process occurs when a fluid, such as air or water, absorbs heat and moves from a warmer area to a cooler area, subsequently transferring the heat along with it.
When heat energy travels by convection energy is transferred by the circulation of heated material?
Yes, when heat travels by convection the energy is transferred by the circulation of a heated fluid, such as air or water.
A circular movements when heated fluids rises and is replaced by a cooler fluid is called?
The circular movement you are describing is called convection. This process occurs when heated fluid rises due to decreased density and is replaced by cooler fluid, creating a continuous circular flow.
