Environmental Science
Typically, water vapour occupies about what percentage of the air's volume near the earth's surface?

Close to 10 percent
About 21 percent
About 78 percent
Less than 4 percent
None of these

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Environmental Science
When the air is saturated, which of the following statements is not correct?

The relative humidity is 100 percent
The air temperature equals the dew point temperature
The wet bulb temperature equals the dew point temperature
The air temperature equals the wet-bulb temperature
An increase in temperature will cause condensation to occur

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