CHEMISTRY MIDDLE SCHOOL

PLEASE HELP!!!A vacuum flask keeps its contents warmer or cooler than the surrounding environment for a length of
time. It consists of two flasks, one inside the other, that connect at the neck. The space between the two
flasks is completely empty of air.

Q-Why does the design of the vacuum flask minimize heat transfer by conduction?

A)- One flask is smaller than the other flask.
B)- One flask is more reflective than the other flask.
C)- There is no air between the two flasks.
D)- The two flasks do not touch each other, except at the neck.

Answers

Answer 1
Answer:

Answer is: C) There is no air between the two flasks.

Heat in this example can transfer throw thermal conduction.

Because there are no mo molecules to transfer heat, there is no conduction.

Thermal conduction is the transfer of heat through physical contact. Thermal conduction is the transfer of heat by microscopic collisions of particles. Heat spontaneously flows from a hotter to a colder body.

The process of heat conduction depends on four basic factors: the temperature gradient, the cross section of the materials involved, their path length and the properties of those materials.

Because there are no mo molecules to transfer heat, there is no conduction.
Answer 2
Answer: C. Heat could easily travel through the molecules in the air and escape/enter the flask. Removing the air slows down the heat transfer. 

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