1) what is the dew point of an air sample with an temperature of 30 C and a mixi

Question

1) what is the dew point of an air sample with an temperature of 30 C and a mixing ratio of 17 g kg1?

remember that air is saturated at the dew point. Use table 5.2 to confirm that the mixing ratio from question 22 ( 17 g kg1) is the saturation mixing ratio for the dew point that you derived from figure 5.2 this illustrates how temperature relates to saturation mixing ratio and how dew point relates to mixing ratio.

2) Now consider an air sample with a temperature of 34C and relative humidity of 62%.

What is the saturation mixing ratio?

What is the mixing ratio?

Plot the air sample on figure 5.4. What is its dew point?

3) determine the saturation mixing ratio of the following air samples, and calculate the ralative humidity of each.

Temp. Saturation Mixing Ratio      Mixing ratio   Realtive Humidity

14 C                                                  5

14 C                                                  9

24 C                                                  5

24 C                                                  2

34                                                      7

4) in the winter, cold air is brought into homes and heated. How does this change the relative humidity of the air?

5) explain why the basement of a house often has high relative humidity in the summer?

6) Rank each of the following air samples from 1 ( highest) to 5 ( lowest) in order of water.

Temp.    Saturation Mixing Ratio       RH     Actual Mixing Ratio     Rank

14 C                                                       90%

20 C                                                       60%

24 C                                                       40%

30 C                                                        40%

34 C                                                        30%

7) from the above example , can you suggest one disavantage to using relative humidity?

Explanation / Answer

Relative humidity is an indicator of the fact whether the air is saturated or not.Even if the amount of moisture is less,the air can become saturated and with more moisture content,air can remain unsaturated.Both are possible.So, 100 percent relative humidity can show that the air is saturated but it cannot indicate the actual amount of moisture content.In that way it is disadvantageous.

It give you the % of humidity at a certen time and certen tempreture. it is not giving the exact amount of water vapour in a 1cm of atmosphere

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