These formulae deal with the Debye design in the least temperatures. The greater elementary formulae specified additional down provide the asymptotic habits within the limit of lower and high temperatures. needs to be determined and utilized as the value on the normal sonic velocity c s . displaystyle c_ s https://www.facebook.com/permalink.php?story_fbid=pfbid024JwvhFGPd3SjV2LBwx6F989guiNoxoPboAZ3UFZ578tKks6mVBSn7FDgrqGhUcNhl&id=61562415773754&__cft__[0]=AZVEd_GzL8H-zKcErk7V0RNeIHZNXuschoBecsj52E04VIrjwLQhC9ddsHQWBO01orHyweyzpUD1FzyWHl6zfnTB4O3hpCMHTRXOfesmt-TloQqbZMfPmqsySqm5wklmtQoN660Qs5dVcwB25x0_GTvDggZxxRbGax-G8B-2mlVrh5RMheoveYRyEdAxBEHxLnMW1I3pFH1nSF3zbE7iMSsM&__tn__=%2CO%2CP-R