Period+2+Group+3

Response to Investigation 6 Essential Question(s)**
 * Period 2 Group 3

=If you want to know whether water vapor is in the air then the best thing to do is take it out. Water vapor gets into the air when the air gets heated and it evaporates. If you cool the air, the water will condense onto a surface. However, the water can't condense until the air reaches saturation or dew point. At this point, there is no more space for all the vapor so it has to attach to a surface. We did an experiment in class with ice in a cup and we took the water vapor out of the air by adding ice until the air around cooled enough to reach saturation. We then concluded that there is water vapor in the air and we are able to take it out. The way we determine the amount of water vapor is through humidity. Water vapor gets into the air in three major ways, evaporation, transpiration, and respiration. Plants use transpiration, while animals and humans use respiration.= ==Humidity is the amount of water vapor in the air compared to how much it can hold. Dew point is the temperature when the air becomes saturated. We learned this when we analyzed the ice lab and connected it to the making clouds lab. Humidity is measured as a percent and dew point is measured in degrees Celsius. We know this because we read an article called "Dragon's breath" and the article gave us specific information about relative humidity and dew point. After reading this article, we can conclude and support that humidity is the amount of water vapor compared to how much the air can hold, and dew point is when the air is saturated, humidity is measured in percent and dew point is measured in degrees Celsius.== =**Clouds form after the water from Earth's surface has evaporated and turned to vapor in the air. The water vapor attaches onto condensation nuclei. That is a surface where water vapor condenses in the atmosphere. Condensation nuclei can be anything from dirt to pollen to dust. Dew is formed in a similar way. Water vapor condenses to a colder surface such as grass. We know this because of our bottle demonstration where we saw condensation as Mrs.Walton added ice. The only way water vapor can condense onto the condensation nuclei is if the temperature and dew point meet. If that happens, millions and millions of water vapor molecules condense to the condensation nuclei and a cloud is formed.**=
 * 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?**

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