Chapter 5 Weather. What is weather? What makes weather change?
What is weather
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Transcript of What is weather
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What is
weather?
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Weather• Weather it is the condition of the atmosphere
at a particular time and place .
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What can cause the changes of weather?
• Weather variables:
1) Temperature
2) Wind
3)Moisture
4)Precipitation
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How to predict weather ?
1)Weather Balloons 2) Weather satellites
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• 3)Doppler radar
It IIt can detect :1)Precipitation2)Wind direction3) Wind speed
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Insolation • It is the amount of sun energy reaching the
Earth at a given time and place
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What is the angle of insolation?
• a measure of how high the sun is in the sky • measured from the horizon up to the position of the sun
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What happens as the angle increases or decreases?
• As the angle of insolation increases, intensity increases. (heat concentrated in smaller area.)
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• As the angle of intensity decreases, heat is spread out over a larger area.
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Low angle: Less absorbedHigh angle: More absorbed
• Intensity of insolation varies over the Earth because of the curvature of the Earth.
Earth
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Where is intensity the greatest and lowest?
• Intensity greatest near the Equator.
– Sun’s rays are direct
• Intensity low at the poles
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At what time is the angle and intensity of insolation greatest?
•The noon sun has the greatest angle of insolation.
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How to measure angle of insolation ?
• WE can measure ion angle of insolation
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Why does the angle of insolation change between midday and
evening?
The angle of insolation decreases because the Earth’s rotation ,and the air temperature usually decrease
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Measuring Temperature
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Pressure• It is the weight of air pressing on a unit area.
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• The difference of air pressure is due to unequal heating of the Earth.
• Warm air masses have fewer air molecules than cold air masses.
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What is the relation between temperature and pressure ?
As the temperature increases the air particles are far away from each other decreasing the pressure As the temperature increases the pressure decreases
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Air Pressure• Air Pressure is a
measure of the force of the air pressing down on the earth’s surface
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Air Pressure can vary at any particular
point on the Earth depending on the
density of the air
Density = mass / volume
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Challenge:
Solution:
Results and
Explanation:
How can you stop the leak in this soda can?
Title: Activity 2. Stop the Leak Date: Feb. 2010
Summary:
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Convection Cell-Suppose air in an area is cool and under high pressure
-If a near by place is warmer and at a lower pressure
-The air will move from high pressure area to a low pressure area .
This is called “Surface wind”
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• What do you think can increase the intensity of the wind ?
• As the difference in pressure increases the wind intensity increases
• Unequal heating and cooling of air results in difference in pressure
• Where warm air will move
• Up and cold air moves down making a circular pattern of rising and sinking air and wind called “Convection cell”
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Sea Breeze
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Land Breeze
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Instruments used to measure ”Wind and Pressure”
1)Anemometer
A device used to measure wind speed .
The cups spin faster as the wind blow faster
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2)Weather Vane
It is used to measure wind direction . It ‘s a movable arrow that points in the direction the wind blowing .
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3)Barometer
Measures surrounding air pressure against standard air pressure