Neon has an expansion ratio of 1:1400 when transitioning from liquid to gas, raising questions about its viability as rocket fuel. The discussion explores the energy requirements for using neon, particularly whether it would be more effective below its triple point or as a supercritical fluid at room temperature. The importance of evaluating potential fuels based on stored energy rather than just expansion ratios is emphasized. Comparisons are made to water-steam, which, despite a high expansion ratio, is ineffective as rocket fuel without added energy. Overall, the conversation highlights the complexities of assessing neon and similar substances for rocket propulsion.
