Environmental Science
The heat energy released when water vapour changes to a liquid is called:

Latent heat of fission
Latent heat of condensation
Latent heat of fusion
Latent heat of evaporation

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Environmental Science
The wind-chill factor:

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

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