A thermos keep hot drinks hot B: By limiting the amount of thermal energy that flows out of the drink
What is mechanism behind thermos ?
By reducing heat transfer, a thermos—also referred to as a vacuum flask is intended to maintain hot beverages hot. By generating a vacuum space between the flask's inner and outer layers, it accomplishes this. By reducing heat transfer by conduction and convection, this vacuum zone serves as insulation.
A bottle having a double-walled compartment within is called a thermos. During building, the air between the two walls is drawn out, leaving a vacuum. A thermos is made to keep hot things hot by preventing heat from escaping, as opposed to having a heating element within.
complete question;
How does a thermos keep hot drinks hot?
A: By absorbing radiant energy that might enter the thermos
B: By limiting the amount of thermal energy that flows out of the drink
C: By limiting the amount of cold that flows into the drink
D: By transmitting radiant energy into the thermos