Question

what is convection?

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Answer 1

Convection is the circular motion that happens when warmer air or liquid — which has faster moving molecules, making it less dense — rises, while the cooler air or liquid drops down.

Answer 2

Sodium (and to some extent potassium) form peroxides, X2O2, containing the more complicated O2−2 ion. Potassium, rubidium and cesium form superoxides, XO2. containing the superoxide ion, O−2.

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