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Water, Air, and Weather

Water, Air, and Weather. Created by: LaShaun Ellis and Corey Feldman. Exploring Water, Air, and Weather. What is evaporation ?. Evaporation is the process by which water goes into the air, changing from a liquid to a gas or vapor . When do we see this in real life?.

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Water, Air, and Weather

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  1. Water, Air, and Weather Created by: LaShaun Ellis and Corey Feldman

  2. Exploring Water, Air, and Weather

  3. What is evaporation? Evaporation is the process by which water goes into the air, changing from a liquid to a gas or vapor. When do we see this in real life? • When you boil water do you ever notice the steam coming out of • the pot? • You are witnessing evaporation! Evaporation after a rainstorm.

  4. Rate of Evaporation Two dishes were each filled with three teaspoons of water, one dish is placed under a light source and the other is placed in the shade. After 15 minutes the dish under the light had two teaspoons of water in it, the dish in the shade still had three. We found that the water evaporated at a rate of one teaspoon per 15 minutes.

  5. What is condensation? Condensation is the process by which water vapor in the air is changed into liquid, it is responsible for the formation of clouds. Where does this occur in the world? • If you wear glasses and go from the cold outdoors to the warm indoors, the lenses fog up as small water droplets coat the surface. • What about the beads of water • that collect on a cold glass of liquid • In the summer? Condensation!

  6. What about precipitation? Precipitation is water released from clouds in the form of rain, freezing rain, sleet, snow, or hail. Most precipitation falls as rain. Did you know… • For precipitation to happen, first tiny water droplets must condense on even tinier dust, salt, or smoke particles, which act as a nucleus. • The common raindrop is actually shaped more like a hamburger bun.

  7. The Water Cycle in Motion Click the link below for a musical interlude! Water Cycle Boogie Music Video

  8. Have you ever heard someone say, “it’s not the heat • it’s the humidity?” • High humidity makes people feel hotter outside because it reduces the effectiveness of sweating which helps to cool the body. This prevents the evaporation of perspiration from the skin, making us feel “sticky.” What is humidity? • Is there a relationship between the temperature outside and • the humidity? • Of course there is! The hotter the air, the more water it contains. When the • air is full of moisture, there is a high level of humidity. It is the amount of water vapor that exists in a gaseous mixture of water and air. • How do we know how much humidity is in the air? • Absolute humidity is the quantity of water in a particular • volume of air, measured in cubic meters. The amount of vapor that can • be contained in a cube of air is the absolute humidity in that cubic meter • of air.

  9. How do we know how much humidity is in the air? • Absolute humidity is the quantity of water in a particular • volume of air, measured in cubic meters. The amount of vapor that can • be contained in a cube of air is the absolute humidity in that cubic meter • of air. How does absolute humidity help weatherforecasters? • Absolute humidity is needed to find the relative humidity. Relative humidity helps weather forecasters determine the possibility of precipitation. A reading of 100% relative humidity means the air is completely saturated with water vapor and cannot hold anymore, which means that it might rain. If the relative humidity near the ground is much less than 100%, it probably won’t rain. To understand relative humidity take a look at this picture:

  10. The Reasons for the Seasons • As the Earth rotates, it’s tilted at about a 23.5 degree angle, instead of being straight up and down like a spinning top. • This changes the angle at which sunlight hits the surface as Earth makes its yearly journey around the Sun.

  11. The Reasons for the Seasons (cont’d) • The Northern Hemisphere (the one we live in), gets more sunlight when Earth is tipped toward the Sun, so it’s hotter (summer). • At the same time, the Southern Hemisphere • is tilted away from the Sun. The sunlight • spreads out more thinly over a greater area • there, so it’s colder (winter). • The differences in air temperature help • create our different seasons.

  12. How do People Effect Air, Water, and Weather? • Whenever we watch television, drive a a car, or play video games, we effect • air, water, and weather. • These things burn fossil fuels (oil, coal, and gas) to make them work, which puts more carbon dioxide into the atmosphere, making the Earth warmer! Scientists call this Global Warming. Check out this video to see how we effect the weather! • A warmer Earth may lead to changes in rainfall patterns, a rise in sea level, • and a wide range of impacts on plants, wildlife, and humans.

  13. Searching for the Ways People Effect Air, Water, and WeatherScavenger Hunt • Where does our water supply come from and how does all that water get to a city of 8 million people? Find out by searching for a movie on “Our Water Supply” at our Filamentality Web site Water, Air, and Weather at: http://www.kn.att.com/wired/fil/pages/listwaterala.html • What are the three sources of air pollution? Find out at http://www.sparetheair.org/teachers/bigpicture/IIIA2.html • What items in your house make air quality better? What items in your house make air quality worse? Play the “Clean Air Challenge Game” to become an air quality leader! http://www.sparetheair.org/teachers/bigpicture/IIIF1a.html

  14. Scavenger Hunt (keep searching!) • What is the Greenhouse Effect? To find out go to http://epa.gov/climatechange/kids/greenhouse.html • How do people contribute to Global Warming? Find out by searching for a movie on climate change on our Filamentality Web site: http://www.kn.att.com/wired/fil/pages/listwaterala.html • How does Global Warming effect the Water Cycle? Click here to find out: http://epa.gov/climatechange/kids/water_cycle_version2.html When you’re done, take the quiz to test your knowledge on how Global Warming effects the Water Cycle!

  15. The Hunt Goes On! • What are four things that could be affected by climate change? Go to http://epa.gov/climatechange/kids/bigdeal.html to find out! • What is the air pollution like in our city right now? Record the level of Fine Particles and Ozone, our Temperature, Humidity, and Wind by clicking on the city we live in at: http://www.hazecam.net/

  16. Scavenger Hunt (the hunt goes on!) • What is deforestation and how does it affect the climate? Find out at http://www.weatherwizkids.com/climate.htm • What are the causes of acid rain and how does it get carried around? Read the “Tale of Lucy Lake” to discover these answers by clicking here http://www.epa.gov/acidrain/education/site_kids/lucy/1.htm

  17. The End

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