A metal cooking vessel is used for heating food. Its walls are thick. Hot cooking oil at 120^{\circ}C is poured into the vessel.
(a)[3]
Explain how the remaining thermal energy is conducted through the metal container to the outside surface by a different process.
(b)[3]
Explain how this lowers the power that must be provided to keep the oil at the correct temperature.
(c)[1]
Explain the benefit of choosing a spherical container.
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