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May 6, 2015 BR: What is humidity? L93- Bell Ringers R94: Air Density • Density = amount of material in a given volume of space • For a solid, the density remains the same even as the environment changes (a gold bar is the same at sea level, under the ocean and on top of a mountain) • For gas, such as air, density can change R94: Air Density • Factors that affect air density: – Pressure – Temperature – Humidity R94: Air Density Pressure: – Weight of column of air – Increase amount of weight = more crammed the air molecules get – Increase in pressure = more dense R94: Air Density Temperature: • When you heat air, the molecules have more energy and spread apart • Warmer air = less dense R94: Air Density Humidity: • The amount of water vapor in the air • Increase in water vapor (means air has less mass) = less dense L95: Severe Cyclonic Storms Quick Write: What is the difference between a hurricane, typhoon and a cyclone? L95: Severe Cyclonic Storms Hurricanes, typhoons and cyclones are all the same weather phenomenon: BUT they have different names depending on where they form in the world. Needed for Cyclonic Storms to form: • Warm tropical oceans • Moisture • Light Winds L95: Severe Cyclonic Storms Hurricane: Atlantic and Northeast Pacific Typhoon: Northwest Pacific Cyclones: South Pacific and Indian Ocean Cyclonic Storm Assignment Pick ONE cyclonic storm that has occurred (hurricane, typhoon or cyclone) anywhere in the world. Create a flyer/poster (by hand) about that storm and how to prepare or prevent them Cyclonic Storm Assignment Include: Name of Storm When and where it happened What caused it? Triggered it? What damages were done? Death toll? How can we prepare for these storms? Can they be prevented? If so, how? Pictures! R95: Importance of Water Vapor