Chapter 17: Phases and Phase Changes
Puzzles



1.  

"Vacuum Sucks!"
A vacuum chamber designed to be pumped down to a pressure of 10-4 Pa has stainless steel walls that are 3 mm thick. You must design a new chamber that can be pumped down to a pressure of 10-5 Pa. How thick must the walls of the new chamber be?
  1. 0.3 mm
  2. 3 mm
  3. 1 cm
  4. 3 cm

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