Environmental Science
The wind-chill factor:

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

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Environmental Science
Much of Tibet lies at altitudes over 18,000 feet where the pressure is about 500 mb. At such altitudes, the Tibetans are above roughly:

25% of the air molecules in the atmosphere
50% of the air molecules in the atmosphere
10% of the air molecules in the atmosphere
75% of the air molecules in the atmosphere

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