Which statement describes a key characteristic of humidity?

Question

Options

• AAir temperature does not affect air water vapor content.
• BAs temperature increases, the air can hold more water vapor.
• CAs the temperature increases, the air can hold less water vapor.
• DAs the temperature decreases, the air can hold more water vapor.

• A
  7% (2)
• B
  73% (22)
• C
  17% (5)
• D
  3% (1)

Explanation

Warm air molecules move faster and spread apart, creating more space to accommodate water vapor molecules, which is why B is correct: higher temperatures allow air to hold greater amounts of water vapor before becoming saturated. Option A is wrong because temperature is directly linked to water vapor capacity - it is one of the most important factors governing humidity. Option C reverses the actual relationship; it is cooler air, not warmer air, that holds less moisture. Option D is also incorrect because decreasing temperature reduces the air's capacity for water vapor, which is why dew and frost form as surfaces cool overnight.

Memory tip: Think of warm air as an expanding sponge - the hotter it gets, the bigger it grows and the more water it can absorb.

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