I think you mean why does hot sand heat the air by convection... The sand is heated by the sun, and the air is touching the sand, which is hot, so by convection, the sand is heating the air.
Convection
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Convection ovens have a fan in them which circulates the air. That makes for faster cooking (20%)
I think it is an example on convection.
No, voltaic cells (most of what you call "batteries" are actually voltaic cells) work by oxidation and reduction. "Isothermal convection" is a term with which I am unfamiliar that seems like an oxymoron; if everything is the same temperature (isothermal) then convection won't occur, because temperature differences are what drive convection.
If the glider has a roasing chicken inside, it will cause some convection waves, this will lift the Glider up.
Convection and conduction.
Sand blaster, silica sand is blown at high pressure as an abrasive.
convection is heat transfer through high temp to lower temp with the help of fluid medium.ex:heat exchangers
Heat energy and a temperature difference.
by transfer of hear with warm going to cold!