01 Askeland Chap 9/27/05 1:48 PM Page 1
Introduction to Materials Science
Steel is often coated with a thin layer of zinc if it is to be used outside. What characteristics do you think the zinc provides to this coated, or galvanized,
Tacoma Washington Bridge Disaster
The decision to shallow and narrow girders proved to be the original Tacoma Narrows Bridge's
undoing. With such minimal girders, the deck of the bridge was insufficiently rigid and was easily
moved about by winds.
26(a) Aluminum foil used for storing food weighs about 0.3 g per square inch. How
many atoms of aluminum are contained in this sample of foil?
In a one square inch sample:
(0.3 g)(6.02 1023 atoms/mol)
= 6.69 1021 atom