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← ScienceWhich outcome results when hydrogen's *ortho* to *para* conversion stalls in cryogenic fuel?
A)Increased equilibrium vapor pressure✓
B)Enhanced pump cavitation erosion
C)Reduced cooling system efficiency
D)Minimization of propellant thermal gradients
💡 Explanation
*Ortho*-hydrogen's decay releases heat via nuclear spin *relaxation*, because the slow conversion at low temperatures causes localized warming; therefore, vapor pressure increases in the tank rather than enabling full liquid cooling or improved pump performance.
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