Friday, March 15, 2013

Lab#11: Relative humidity lab

watch before lab


this marking period's extra credit..... all the Jan Regents from 2006 -2012

you need to include all the correction of the ones you got wrong to get credit.

Homework 6B: 

read pg 170-172, 182,-184
Do pg 178-179 # 3,5,6,8,9
Do Pg 188#1,2,7,8,9 to 12
Do Pg 190 #15 use graph paper


Spring Break assignment: 
June 2012 Regent 
(draw out the answer to your assigned question questions)
Period 7 (#1-27)
Period 1( # 31 to 65)

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This week's Lab:  You will need you ESRT Pg 12-13 




1.   Compare the air temperature and relative humidity of your classroom, hallway (or other room), and outdoors. Are they all the same? Discuss reason(s) in detail.

2.   On the weather station models, provided record and label the available air temperature values for classroom, hallway/other classroom, outdoors and weather station as it appear in the Reference Tables.

3.   How is evaporation a cooling process? Explain your answer. Give real life examples.

4.      Do you feel colder when you are wet or dry?  Explain.

5.     If the wet-bulb and dry-bulb temperatures were equal after using a sling Psychrometer, what would this mean about the condition of the air? Explain.

6.      Assume that you have a container filled with water at room temperature. If you wet your hand with this water, the wet hand will feel colder than the dry one (in the air) even though they both have the same temperatures, Explain why this is possible.
7.      How does a fan help you keep cooler on a hot summer day? Explain.
 
8.      How are temperature and water vapor holding capacity of the air, in general, related?

9. Assume that the amount of water vapor in the air stays the same. What would happen to the relative humidity if the air temperature increases?

10.Assume that the amount of water vapor in the air stays the same. What would happen to the relative humidity if the air temperature decreases?

11.      Why do we need to use humidifiers in wintertime to prevent dry skin, bleeding nose, chipping lips?

12.      Why do we need to use dehumidifiers, especially in the basements, in summertime to remove excessive moisture from the air to prevent growth and smell of mildew/mould, paint blistering, paint chipping and other problems?








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