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Vocabulary Words for
Chapter 15/ Section 1:
Water in the Air
(1) Weather
Sentence:
In good weather, my family
plans lots of outside events.
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Context Clues:
Good; outside events


Weather: [noun] The daily conditions of the
atmosphere in terms of temperature, atmospheric
pressure, wind, and moisture. (page 506)
Synonyms:
None.

Antonyms:
None.

(2) Humidity
Sentence:
In many areas of the United States, the high humidity
makes you feel warmer than it actually is. This can be
very uncomfortable.

Context Clues:
High humidity; warmer than it actually is


Humidity: [noun] The amount of water vapor in
the air. (page 507)
Synonyms:
Moisture; wetness; sweatiness

Antonyms:
Dryness; aridity

(3) Vapor Pressure
Sentence:
When water molecules are added to dry air, there is an
increase in air pressure. This increase is caused by
vapor pressure.

Context Clues:
Increase; pressure


Vapor Pressure: [noun] The part of the total
atmospheric pressure that is caused by water
vapor. (page 507)
Synonyms:
None.

Antonyms:
None.

(4) Condensation
Sentence:
In cold weather, condensation forms on the kitchen
window.

Context Clues:
Cold weather; window


Condensation: [noun] The change of state from a
gas to a liquid. (page 509)
Synonyms:
Water droplets; moisture

Antonyms:
None.

(5) Evaporate
Sentence:
As a result of radiation, water evaporates from oceans
and lakes.

Context Clues:
Radiation; oceans; lakes


Evaporate: [verb] To change from a liquid into a
vapor or gas.
Synonyms:
Dry up; vaporize

Antonyms:
Condense

(6) Dew Point
Sentence:
The dew point depends on the levels of condensation
and evaporation.

Context Clues:
Condensation; evaporation


Dew Point: [noun] The temperature at which the
rate of condensation equals the rate of
evaporation. (page 507)
Synonyms:
None.

Antonyms:
None.

(7) Relative Humidity
Sentence:
Relative humidity is a measure of how close the air is to
the dew point.

Context Clues:
Air; dew point


Relative Humidity: [noun] The ratio of the amount
of water vapor in the air to the amount of water
vapor needed to reach the dew point. (page 507)
Synonyms:
None.

Antonyms:
None.

(8) Precipitation
Sentence:
The level of precipitation is highest during winter and fall;
precipitation is usually low during summer.

Context Clues:
Highest during winter and fall; low during summer


Precipitation: [noun] Any form of water that falls
to earth’s surface from the clouds. (page 510)
Synonyms:
Rain; sleet; hail; snow; moisture.

Antonyms:
None.
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