Environmental Science
As the air temperature increases, the air's capacity for water vapour:

Remains constant
Decreases
Is unrelated to air temperature and can either increase or decrease
Increases

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Environmental Science
The wind-chill factor:

Determines how low the air temperature will be on any given day
Relates body heat loss with wind to an equivalent temperature with no wind
Indicates the temperature at which water freezes on exposed skin
Tells farmers when to protect crops from a freeze
Takes into account humidity and air temperature in expressing the current air temperature

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