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March 17, 2015 Bell Ringer 3/16 5 friends were looking at large, white, puffy clouds in the sky. They wondered what the clouds were made of. This is what they said: Pick who you think is correct Grace: "I think clouds are made of soft, cotton like material." Noah: "I think clouds are made of large drops of water." Anthony: " I think clouds are made of smoke that rises from the land." Logan: " I think clouds are made of evaporated water in the form of gas." Jared: " I think clouds are made of tiny drops of water or tiny ice crystals." Answer: JARED!!!!!!! Clouds are made of tiny drops of water or ice crystals. Clouds are not all the same! March 17, 2015 • Real clouds form when warm air rises in the atmosphere and cools down. Cloud condensation nuclei, such as small particles of dust and pollution, enable water molecules to stick together and stop bouncing around. The water molecules condense around the nuclei to form clouds. Clouds are just groups of tiny water droplets that stick together around cloud condensation nuclei when temperatures are low. • How does the cloud in a bottle form? • Clouds are more likely to form when it's cold. When you squeeze the bottle, the pressure increases. This causes the temperature inside the bottle to rise. When you release the bottle, the pressure decreases. This causes the temperature inside the bottle to fall and the water molecules to condense. The smoke particles act as cloud condensation nuclei, allowing the water molecules to condense and stick together around the smoke. There you go - a cloud in a bottle! March 17, 2015 Review Questions: 1. Why was the smoke needed for the cloud to form? 2. Why did you need to increase the pressure in the bottle for the cloud to form? http://www.sophia.org/tutorials/bill-nye-the-science-guy-cloud-in-a-bottle-demonst How does it work? Even though we don't see them, water molecules are in the air all around us. These airborne water molecules are called water vapor. When the molecules are bouncing around in the atmosphere, they don't normally stick together. Pumping air into the bottle forces the molecules to squeeze together or compress. Releasing the pressure by removing the stopper allows the air to expand and by doing this, the temperture of the air becomes cooler. This cooling process allows the molecules to stick together, or condense, more easily to form tiny water droplets. These groups of tiny water droplets are what makes a cloud. Clouds on Earth form when warm, moist air rises and its pressure decreases. The air then expands and cools. As the temperature drops below the dew point, clouds form. Tiny, invisible particles in the air such as pollution, smoke or dust provide the nucleus on which the water molecules can attach and collect. March 17, 2015 3 Key Ingredients: 1. 2. 3. http://www.youtube.com/watch?v=sGTSNYF8qIk March 17, 2015 March 17, 2015 Identifying Clouds Video http://www.youtube.com/watch?v=QWeorlkJ39M