Answer :
Final answer:
In a vacuum flask, the vacuum predominantly prevents conduction and convection, as they require a medium to occur. However, radiation, which transfers heat through electromagnetic waves, can still occur.
Explanation:
In a vacuum flask, the methods of heat transfer that are predominantly prevented by the vacuum are conduction and convection. To explain further, heat is transferred by three methods: conduction, convection, and radiation. Conduction is the transfer of heat between two objects that are in direct contact with each other. Convection is the transfer of heat by the movement of mass or fluid. A vacuum flask, being a near perfect insulator with a vacuumed space, prevents these two heat transfer methods because it lacks a medium necessary for conduction and convection to occur. On the other hand, radiation, which is the transfer of heat through electromagnetic waves, can still happen in a vacuum, hence, it is not fully prevented in a vacuum flask.
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