Do convection currents occur in every body of water and gas?

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    Convection Currents
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SUMMARY

Convection currents occur in all bodies of water and gas, driven by temperature variations. While theoretically present at all times, practical convection is most evident when specific heat sources, such as heaters, are involved. The discussion emphasizes that understanding the principles of convection allows for the prediction of its occurrence in various fluids, regardless of scale.

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KaneOris
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Do convection currents occur in all bodys of water and gas?
Or are they only at a certain temperature, under certain circumstances?
 
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I believe that on a very small level, they occur under all circumstances in all fluids. In theory, any variation in, for example, the exterior temperature around a Thermos bottle will cause the fluid inside to exhibit convection. More practically, however, convection occurs most notably when specific sources of heat/cooling exist, for example in a room with a heater. Remember how convection works and you should be able to figure out when it will occur.
 

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