Discussion
Cooling a tunnel's nitrogen from \( 300 \) K to \( 110 \) K raises the density by a factor of about \( 2.7 \) and lowers the viscosity by a factor of about \( 2.2 \). The Reynolds number rises by roughly
Answer: C
Reynolds number goes as density over viscosity at a fixed speed and size, so the two effects multiply: \( 2.7 \times 2.2 = 5.9 \), close to six. This is the whole case for cryogenic testing, and it is achieved without touching the Mach number.
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