I: Stopper* (or Cork)
Physics
ScanSolve AI Answer
Here are the answers to your questions about the Thermos flask:
i.
- I: Stopper (or Cork)
- II: Outer casing (or Outer wall)
- III: Vacuum
- IV: Silvered surface (or Reflective coating)
- V: Inner wall (or Inner container)
ii.
- a. Conduction: The vacuum (III) between the inner and outer walls is a poor conductor of heat, and the stopper (I) is made of a material that is also a poor conductor, minimizing heat transfer through direct contact.
- b. Convection: The vacuum (III) prevents heat transfer by convection because there is no air or other medium to form convection currents between the walls. The stopper (I) prevents air from moving in or out of the flask opening, stopping convection from the top.
- c. Radiation: The silvered surfaces (IV) on both the inner and outer walls are highly reflective, which minimizes heat transfer by radiation by reflecting infrared rays back into or away from the flask.
iii.
One use of a vacuum flask is to keep hot liquids hot (e.g., tea or coffee) for extended periods.
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