I'm working on a science project where I measure the dBs lost in a box lined with certain materials and I think I'd like to incorporate the coefficient of sound-absorption for the different materials in the project. I've looked through my physics II book (nothing found) and checked out google but the sites seem either for construction or other physics lessons where the coefficient is merely mentioned. I'd like maybe some good physics websites that can go a little more in-depth with the subject. Nothing too advanced but I'll take from beginner to whatever level you think a fairly smart 11th grader could handle. I'd like to be able to experimentally find the coeffiecents for a few different materials and then compare with the originals (yay, teachers love error analysis). I've done another project in which I found the coefficient of static friction and I figured through manipulation of the formula and determination of the other variables the sound-absorption coefficient can be found similarly. Thanks for any help.