A vacuum flask is designed to keep drinks hot by minimizing thermal energy transfer. It consists of a double-walled glass container with a vacuum in the space between the walls.
Which method or methods of thermal energy transfer across this gap are prevented by the vacuum?
conduction and convection
conduction and radiation
convection and radiation
radiation only
301 exam-style questions on CIE IGCSE Physics 2.3 Transfer of thermal energy, covering 2.3.1a Thermal conductors and thermal insulators, 2.3.1b Explaining thermal conduction, 2.3.2 Convection, 2.3.3a Thermal radiation, 2.3.3b Surface colour and texture, 2.3.3c Rate of emission and absorption of radiation, and 2.3.4 Consequences of thermal energy transfer. Each one has a worked solution and a mark scheme showing where the marks go.