Because of the shell arrangements of electrons in various atoms and molecules, some substances are quite good at allowing a few electrons to move about freely (e.g., copper, silver, gold, aluminum), ...

PROF. W. G. CADY'S exposition of the basic equations of piezo-electricity in his recent book “Piezoelectricity” contains errors which should be brought to the attention of students and workers in this ...

Maxwell’s equations of electromagnetism and the Euler equation top a poll to find the greatest equations of all time. Robert P Crease discusses the results of his reader survey First among equals – ...