Brianna Danelon,

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By
Brianna Danelon,
Arlene Waryszak,
and
Christina Sisti
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What is HUMIDITY?

• Humidity is the measure of the amount of water
  vapour in the atmosphere. The more water vapour
  there is in the atmosphere, the more humid it
  becomes. It is what causes those sticky and
  muggy days.

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What Causes HUMIDITY?

• Humidity is caused by evaporation and
  condensation. Water evaporates into the
  atmosphere, which is caused by solar radiation
  being absorbed. In the atmosphere, water vapour
  is converted back into liquid form when air
  masses lose heat energy and cool. This is
  responsible for most clouds and also produces
  rain.

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Time of Year HUMIDITY Occurs...

• Humidity mostly occurs during the warm months
  usually in the summer. It does not occur in the
  winter because the cold air cannot hold as much
  water vapour than warm air can.

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Where in the World is HUMIDITY?
?

• Humidity is found nearly everywhere in the
  world. However, it occurs most often in areas
  along and around the equator because the Suns
  rays directly hit the equator. Also, humidity is
  found near large bodies of water because of the
  heat and moisture given off. Places such as the
  North and South Pole are least likely to have
  humidity.

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Is There HUMIDITY in Ontario?

• Yes there is. Nearly everyone who lives in
  Ontario has experienced humidity. This is mainly
  due to the Great Lakes. The Great Lakes generate
  heat and moisture causing the humidity.

DID YOU KNOW Windsor is known to be the
humidity capital of Canada.
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HUMIDITY's Destruction
Humidity does not cause many environmental
problems, although when there is high humidity,
it may cause wood to expand making doors and
drawers hard to open.

• d

Humidity causes many health problems, such as
dehydration, heat exhaustion, and in the extreme,
heat stroke and hypothermia. Humidity will also
cause arthritis to worsen.
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HUMIDITY's Destruction
A lack of humidity can also cause problems. It
can cause dryness in the membranes of the nose,
throat and bronchial tubes, respiratory
infections, repeated attacks of winter colds and
airborne infections.
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How Often HUMIDITY Occurs
Humidity occurs mostly in the summer because the
summer has the hottest weather, and warm air
holds more moisture. Also, humidity mostly
occurs near lakes and oceans because of the
moisture coming from the water. (i.e. the
Caribbean)
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Factors of Weather that Interact to Produce
HUMIDITY
Evaporation, condensation, and air temperature
interact to produce humidity

• Water evaporates into the atmosphere. When the
  air is warm, the water vapour is easier to hold.
  In the atmosphere, water vapour is made back into
  water droplets when air masses lose heat energy
  and cool.

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Definitions
Relative Humidity the amount of water in the
air relative to the saturation amount of air can
hold at a given temperature multiplied by
100 Absolute Humidity the percentage of water
vapor actually present in the air Dew point
the temperature at which water vapour saturates
from an air mass into liquid or solid usually
forming rain, snow, frost, or dew.
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Interesting Facts

• There is no such thing as "heat lightning".
  So-called heat lightning is just lightning from a
  thunderstorm too far away to be heard
• Adding water vapor (humidity) to the air lowers
  density, weight and pressure of the air
• The temperature of the water molecules remains
  the same while the molecules change state
• Humidity is the main reasons for school
  absentees
• Humidity is the 1 reason for hospitalization of
  children
• Hair length increases with humidity.

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Thank you for listening to our presentation on
Humidity
The End