A vacuum flask has its double walls separated by an evacuated space and the inner…
PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
A vacuum flask has its double walls separated by an evacuated space and the inner surfaces are silvered. Which statement correctly describes the effect of the vacuum on heat transfer across the space?
(a) Only conduction is suppressed; convection and radiation are unaffected.
(b) Conduction and convection are suppressed; radiation can still occur.
(c) Convection and radiation are suppressed; conduction can still occur.
(d) All three modes of heat transfer are completely eliminated.