Period+8+Group+4

Response to Investigation 6 Essential Question(s)**
 * Period 8 Group 4

=We can determine that water vapor is in the air by an experiment /lab we did in class. We took a cup of ice water and left it on our desks. 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. Water vapor gets in our air by evaporation. When liquid water is heated up, it evaporates turning from a liquid to a gas. The water, therefore, is in the air just not in liquid form. I know this because of the demonstration in class we did when we dipped our fingers in water and made a circle with it on the top of our hand. Because our hand was a warmer surface, particles of the water’s molecular motion increased due to conduction, meaning more heat, evaporation and it went up inside the air. Humidity is the amount of water vapor in the air and is measured in percent. I know this from investigation 1 when we had the hygrometer that measured humidity. It was in percent the measurement when we went outside to measure weather factors with tools. Dew point is the temperature when saturated air turns back to a liquid. It is measured in degrees Celsius. I know this because of our Dragon’s Breath article that explains about relative humidity, dew point, etc. It states exactly what dew point is. Clouds form when water vapor in the air attaches onto a condensation nuclei, 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 war. Water vapor condenses to a colder surface such as grass. I know this because of our bottle demonstration where we saw it when you added ice.=
 * 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?**