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Abstract While the design of nozzles for diatomic gases is very well established and covered by published works, the case of a diatomic gas dissociating to monatomic along a nozzle is a novel subject that needs a proper mathematical description. These novel studies are relevant to the definition of nozzles for gas-core Nuclear Thermal Rockets (NTR) that are receiving increased attention for the potential advantages they may deliver versus current generation rockets. The article thus reviews the design of the nozzles of gas-core NTR that use hydrogen as the propellant. Propellant temperatures are expected to reach 9,000-15,000 K. Above 1500 K, hydrogen begins to dissociate at low pressures, and around 3000 K dissociation also occurs at high pressures. At a given temperature, the lower the gas pressure the more molecules dissociate, and H2 → H + H. The properties of the gas are a function of the mass fractions of diatomic and monatomic hydrogen x H2 and x H = 1 − x H2.

This specification covers an aluminum alloy in the form of bars and rods 0.500 in. (12.70 mm) and over in nominal diameter or least distance between parallel sides.

This specification covers an aluminum alloy in the form of bars and rods 0.500 inch (12.7 mm) to 8.000 inches (203.2 mm) in nominal diameter or least difference between parallel sides and up to 50 square inches (322.6 square centimeters) in cross-sectional area (see 8.7).

This specification covers one type of aluminum bronze in the form of rods, bars, forgings, and forging stock.

This specification covers a two-component, air-curing, aluminum-powder-filled, epoxy-resin-base material in the form of a paste or putty, suitable for application by spatula or putty-knife.

This standard establishes uniform test methods for testing electrical connectors.

This specification covers a water-miscible, foam-on, pressure spraying cleaner in the form of a liquid.