Issues

A new scale of ionicity, with which the ionic character of bonding in crystals can be predicted and measured, has led to improved understanding of such crystalline properties as lattice structure, heats of formation, elastic constants and nonlinear optical properties.

Precision measurements of the rate of expansion and the deceleration of the universe may soon provide a major test of cosmological models

A laboratory in which students can reproduce historically significant physics experiments provides them with a useful change of viewpoint.

The adage that solving a physics problem is a question of finding the right coordinate system is demonstrated for electrons in crystals. Coordinates that reflect the regularity of the crystal greatly simplify the problem.