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 resistivity is a measure of a materialâs property to oppose the flow of electric current. This is expressed in Ohm-meters (Ïâm). The symbol of resistivity is usually the Greek letter Ï (rho). A high resistivity means that a material does not conduct well electric charge.