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Which processes result in decreased air density?

  • A

    Increasing temperature, increasing pressure.

  • B

    Decreasing temperature, decreasing pressure.

  • C

    Increasing temperature, decreasing pressure.

  • D

    Decreasing temperature, increasing pressure.

Pressure (P), temperature (T), and density (ρ) are interconnected and change with altitude in the atmosphere.

  • When pressure increases, air compresses, reducing its volume and increasing its density. Conversely, when pressure decreases, air expands, increasing its volume and decreasing its density. Therefore, density is directly proportional to pressure.
  • When a volume of air is heated, it expands, causing its density to decrease while the mass remains unchanged. Consequently, density decreases as temperature increases, meaning density is inversely proportional to temperature.

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