A thermos bottle has a shiny interior. What type of heat transfer does this prevent?

Question

BlackTom AI · Accepted Answer

Consider the scenario: a thermos bottle has a shiny interior designed to minimize heat exchange. 
Option 1: Conduction. This is heat transfer through direct contact or a material substance. A shiny interior doesn’t primarily block conduction; the main path for conduction in a thermos would be through its walls if there were direct contact with a hot or cold object, not via the reflective surface. Therefore, this choice doesn’t capture the primary function of the coating. 
Option 2: Convection. This involves the movement of fluid (air or liquid) transferring heat. The shiny interior does not primarily disrupt air or liquid movement inside the bottle; convection would occur in the air pocket or liquid, but the reflector’s role is not to impede fluid motion. Thus, this option explains a less central mechanism for a thermos’s design. 
Option 3: Radiation. This is heat transfer via electromagnetic waves, such as infrared radiation emitted from hot surfaces. The reflective, shiny interior acts to reflect infrared radiation back toward the contents, greatly reducing net radiative heat exchange with the surroundings. This matches the intended purpose of the interior surface. 
In summary, the reflective interior of a thermos is specifically aimed at minimizing radiative heat transfer, making Radiation the correct description of the type of heat transfer prevented by the shiny surface. Conduction and Convection describe other mechanisms that are not primarily addressed by the interior’s reflective property.

EGEE 102 (SP25): Energy Conservation for Environmental Protection FINAL EXAM

A thermos bottle has a shiny interior. What type of heat transfer does this prevent?

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