Read the passage below:
Aviation maintenance protocols mandate inflating commercial aircraft tires with dry nitrogen rather than standard compressed ambient air. Ambient air contains fluctuating amounts of water vapor and oxygen, both of which introduce severe hazards under extreme flight cycles. At cruising altitudes exceeding 30,000 feet, ambient temperatures plummet below minus forty degrees, causing entrained moisture to freeze into ice crystals that disrupt wheel balance and damage valve stems. Conversely, during high-speed landings, friction heats the tire assemblies to temperatures where pressurized oxygen can sustain internal rubber combustion. By displacing oxygen and eliminating moisture, chemically inert nitrogen stabilizes internal pressure swings and prevents catastrophic thermal blowouts.
Based on the passage, match each excerpted statement to the author's specific communicative intent in including it.
- "Ambient air contains fluctuating amounts of water vapor and oxygen, both of which introduce severe hazards under extreme flight cycles."To define the core chemical vulnerabilities that make ordinary compressed air dangerous in aviation.
- "At cruising altitudes exceeding 30,000 feet, ambient temperatures plummet below minus forty degrees, causing entrained moisture to freeze into ice crystals that disrupt wheel balance and damage valve stems."To provide a concrete environmental example of the physical risks posed by freezing water vapor.
- "By displacing oxygen and eliminating moisture, chemically inert nitrogen stabilizes internal pressure swings and prevents catastrophic thermal blowouts."To summarize how the mandated gas solves each identified risk and achieves overall operational safety.