Congress forcing a compromise(d) Space Shuttle design on NASA. Among other things, the space shuttle was the first human space vehicle to use solid rocket boosters. Solid rocket boosters were previously deemed unsafe for human space flight because once they're lit, they don't stop boosting until the fuel is gone. Liquid-fueled rockets can be shut off.
Definition of conductive. : having conductivity : relating to conduction (as of electricity)
Part of the Electronics glossary: An electrical conductor is a substance in which electrical charge carriers, usually electrons, move easily from atom to atom with the application of voltage. Conductivity, in general, is the capacity to transmit something, such as electricity or heat. substance that does not conduct electricity is called an insulator or dielectric material. Common examples include most gases, porcelain, glass, plastic, and distilled water. A material that conducts fairly well, but not very well, is known as a resistor.