Cause of Challenger Disaster Revealed. William P. Rogers, head of the special commission appointed by President Ronald Reagan to investigate the January 28, 1986, explosion of the space shuttle Challenger, reports his findings at a press conference on June 9, 1986. Cause of Challenger Disaster Revealed. Share.  William P. Rogers, head of the special commission appointed by President Ronald Reagan to investigate the January 28, 1986, explosion of the space shuttle Challenger, reports his findings at a press conference on June 9, 1986.
conÂ·ducÂ·tivÂ·iÂ·ty. n. pl. conÂ·ducÂ·tivÂ·iÂ·ties. 1. The ability or power to conduct or transmit heat, electricity, or sound. 2. The conductance of a material. 3. Physiology The conductibility of a structure, especially the ability of a nerve to transmit a wave of excitation.
Electrical conductivity is the inversion of resistivity, and is a measure of how well a material conducts electric current: in which Ï is the conductivity of the material expressed in Siemens per meter (S/m). In electrical engineering often Îº (kappa) is used instead of Ï.