Before revision: From these limits, theoretical expressions for predicting the specific modulus was devolped, , for ideal extreme-modulus solids, where , , , , and are the reduced Planck constant, electron mass, proton mass, Bohr radius, and the ratio of valence-electron number to atomic mass.
After revision: From these limits, theoretical expression for predicting the specific modulus was devolped, , for ideal extreme-modulus solids, where , , , , and are the reduced Planck constant, electron mass, proton mass, Bohr radius, and the ratio of valence-electron number to atomic mass.