Period+1+Group+3

Response to Investigation 6 Essential Question(s)**
 * Period 1 Group 3

=We can determine that water vapor is in the air by an experiment /lab we did in class and water vapor gets in our air by evaporation. I know we can determine water vapor is in the air because we tried the lab in class. We also know that water vapor gets in our air by evaporation because of a link we explored on fossweb. In the experiment we took a cup of ice water and left it on our desks. To keep the moister inside the cup, we placed seramac wrap over the top of the cup. To make sure that the condensation on the outside of the cup was not the water from inside the cup, we put food dye into the cup so it would clearly show that the condensation was from the air. By observing it, we watched and saw water condense on the outside of our cup. The water vapor in the air condensed to the colder surface proving that there is water vapor in the air. The link on fossweb told us that when liquid water is heated up, it evaporates, turning from a liquid to a gas.= =Humidity is the amount of water vapor in the air and dew point is the temperature at which water vapor changes from a gas to a liquid. I know this because of a article we read called __Dragon's Breath__. In the article it said humidity is the amount of water vapor in the air. The article also said that dew point is the temperature at which water vapor changes from a gas to a liquid.= =Humidity and dew point are measured in two different ways. Humidity is measured in a percentage, and Dew Point is measured with a thermometer. I know this because of the article __Dragon's Breath__, and the wet and dry bulb thermometer lab. There was one wet and one dry thermometer bulb with muslin at the bottom. The wet one had the muslin at the bottom. You'd wave the wet thermometer in the air and you can see the temperature drop which is Dew Point. Dew Point also depends on how much water vapor is in the air, and the humidity depends on the temperature of the air.= =**Clouds and dew are formed in different ways. Clouds are formed when the sun hits some sort of liquid water, making heat transfer happen. When the heat transfer happens then the water will start to evaporate. When the water evaporates it turns into a gas called water vapor. As the water vapor rises into the air, the temperature drops. The air then becomes saturated, and reaches dew point. When the air reaches dew point, that means the water vapor can condense. So the water vapor condenses onto condensation nuclei(dust, smoke exc). Tons more condensation nuclei have to come together in order to make a cloud. Dew is when there is water vapor in the air and the air reaches dew point. When the air reaches dew point it can condense onto objects. If it reaches dew point outside, then the water vapor will condense onto grass, leaves, exc. If the air reaches dew point inside(like in your bathroom) the water vapor will condense onto the mirror, window, exc. I know this is true because of the __Dragon's Breath__ article we read and a lab we did called pressure and temperature relationship. In the article it said that dew is formed when the air reaches dew point and the water vapor can condense onto grass, leaves, mirrors, windows, exc. In the lab we learned that when air is forced into a smaller space the temperature will go up. But when air has more space to be in the temperature will go down. So we learned that when the water, that was evaporated, rises into the atmosphere it has more room, so the temperature will drop. The water vapor will saturate the air, the air will reache dew point, and then condense onto condensation nuclei. This is the conclusion we came to for investigation 6.**=
 * How can we determine that water vapor is in the air and how does it get there? What is humidity and what is dew point and how are each measured? How do clouds and dew form?**