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What is a front

on Jun 01, 2010

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What is a frontPresentation Transcript

• What is a Front?
Made By Kate and Abby G
• Materials
9-inch glass pie plate
Modeling Clay
1 cup tap water
Blue food coloring
Spoon
1 cup liquid cooking oil
Timer
• Steps
Set the pie plate on the edge of a table.
Use modeling clay to form a barrier across the center of the pie plate, dividing it into two equal parts.
Pour the water into the left side of the pie plate.
Add three drops of blue food coloring to the water and stir.
• More Steps
Pour the oil into the right side of the pie plate.
Kneel on the floor in front of the plate so that you are eye level with the plate.
Observe the movement of two liquids for 1 to 2 minuets.
Look at the liquids as often as possible for 5 minuets or until no changes are seen.
• This video explains that the density of air masses varies in that different air masses have different temperatures and humidity's. Cold air masses are more dense than warm air masses. Since water is more dense than oil, the colored water in the experiment represents a cold air mass and the oil represents a warm air mass. Just like the oil and water, cold and warm air masses do not mix with each other. The colder, more dense air mass generally moves under and lifts the warmer, less dense air mass. The boundary between two air masses is called a Front.
• The leading edge of a cold air mass advancing into an area occupied by warmer air is called a cold front.
A warm front is the leading edge of a warm air mass moving into an area occupied by colder air. The weather is usually unsettled and stormy at a front Precipitation is common, especially on the sold air side.
• Precipitation is weather. It can be rain, hail, sleet and tornadoes but it all depends on the temperature and season. They are normally very strong especially in the summer and spring. During the winter, Cold fronts sometimes come through an area with little or no precipitation. In the fall there are mainly heavy rainstorms but no thunderstorms.
• Charts
Kind of front: Description: Weather results: symbols:
Moving cold air
slides under warm air.
2. Moving warm air passes over cold air.
3. Moving cold air meets cool air at a warm front.
4. Moving cool air meets cold air at a warm front this keeps the warm air mass of the ground.
Cold
Warm
Cold Occlusion
Warm Occlusion