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Is an oven that circulates air around food. Conventional ovens, which do not have fans, rely primarily radiation from the oven walls, and to lesser extent, on natural convection caused by temperature differences within the oven, to transfer heat to food. the fans in convection allow more heat to be transfer by convective heat transfer.

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The hot air goes up trying to escape but it can’t because the textile of the balloon is covering so that makes that the balloon goes up, so when they are trying to go down they began to close and open where the fire is place for the balloon can go down.

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The thing of purifying water is the same of the oven, but the difference is that water begins to rotate by the heat it reaches.

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In a fire, the fire man always goes down and tells everyone that needs to be close to the floor for not running so fast of air, because the smoke tries to go out, so it goes up and the oxygen stays down.

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This operates by convection currents circulating through the body of the appliance, and across it’s heating element. This heat up the air, causing to increase in the volume and so become buoyant and rise.

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Physics - Energy - Heat Transfer - Convection