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Which risk increases significantly when a cryogenic storage dewar experiences boil-off?

A)Pressure buildup exceeds burst disk rating
B)Heat pump efficiency improves suddenly
C)Fluid viscosity decreases unexpectedly
D)Internal thermal conductivity remains constant

💡 Explanation

Vaporization increases pressure via phase transition, because *latent heat absorption* cools the remaining liquid less effectively, therefore, pressure rises leading to potential dewar rupture, rather than viscosity decreasing because the volume now occupies a lesser weight.

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