Describe how changing the air pressure affects the temperature at which water boils.

Explain the concept and provide real-life implications. Answer: The boiling temperature of water changes with variations in air pressure due to the relationship between vapor pressure, atmospheric pressure, and phase change. When air pressure increases, the boiling temperature of water also increases, as the substance must be heated to a higher temperature for its vapor pressure to equal the increased atmospheric pressure. Conversely, when air pressure decreases, the boiling temperature of water decreases, as its vapor pressure will equal the decreased atmospheric pressure at a lower temperature. Real-life implications of this concept include the need to adjust cooking times at higher altitudes due to lower boiling temperatures and the decreased effectiveness of boiling water for sterilization purposes at high altitudes, as the lower boiling temperature is less effective at killing bacteria and other pathogens.