In a disaster at sea, life vests (also called personal floatation devices, or PFDs) can save lives. If you were to design a PFD, what material would you use? Why? Be sure to
use the word "density" in your explanation. You may use internet resources to answer
this question. (2 sentences)

their crystal patterns have been disrupted by stress

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.