The vacuum in a thermos flask helps to reduce heat transfer by?
A
convection and radiation
B
convection and conduction
C
conduction and radiation
D
radiation only
Verified Correct Answer: B.
Physical Principles & Numerical Solution
Conduction and convection rely on the presence of molecules to transfer heat. In a vacuum, however, there are no molecules available, making these processes impossible.
Source: Myschool Past Questions Archive (Record #28433)