8 Questions
What is the dew point?
The dew point is the temperature to which humid air must be cooled at constant pressure to become saturated.
What happens if the temperature drops below the dew point?
Condensation occurs.
Why do eyeglasses collect moisture when going from cold outside air into a warm room?
The glasses were below the dew point temperature of the air in the room, causing condensation to occur.
How is the dew point determined?
A vessel is cooled until water vapor begins to condense on its surface, and the temperature at which this occurs is the dew point.
Condensation occurs when the temperature rises above the dew point.
False
People wearing eyeglasses may experience moisture collecting on their glasses when moving from a warm room to cold outside air.
False
The dew point is the temperature at which air becomes saturated.
True
The principle of determining the dew point involves cooling a vessel until water vapor begins to condense on its surface.
True
Study Notes
Dew Point
- The dew point is the temperature at which humid air must be cooled at constant pressure to become saturated.
- If the temperature drops below the dew point, condensation occurs.
- Dew point is responsible for moisture collecting quickly on glasses when going from cold outside air into a warm room.
- The air in contact with the glasses is cooled below its dew point temperature, causing water vapor to condense out.
- The dew point is determined by cooling a vessel until water vapor begins to condense on its surface.
- The temperature at which condensation occurs is the dew point.
- Dew point is important for understanding condensation and saturation of air.
Test your knowledge of dew point and condensation with this quick quiz. See if you can identify the temperature at which condensation occurs and understand why your glasses fog up when you enter a warm room from the cold outdoors.
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