Which risk increases when a rocket propellant using liquid hydrogen experiences boil-off?

💡 Explanation

The propellant mixture shifts because fractional distillation enriches heavier molecular components, therefore off-stoichiometry results, rather than vapor lock (different mechanism), structural icing (hydrogen temperature too high) or hydrogen embrittlement (requires high temperatures).

• Which mechanism causes increased cohesive forces in high-molecular-weight polymers?
• Which outcome occurs when a catalyst degrades in fuel cell?
• Which outcome results when lubricating oil viscosity decreases in an idling engine?
• Which risk increases when applying excessive voltage during aluminum oxide electrolytic cell production?
• Which outcome occurs when degenerate d-orbitals split under distortion?
• Which energy decrease causes increased initiation sensitivity in nitromethane?