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Questions and Tasks: In the graph below, humidity is shown in relation to temper

ID: 114040 • Letter: Q

Question

Questions and Tasks: In the graph below, humidity is shown in relation to temperature (this is the same graph we discussed in class). Specific Humidity (g/kg) is given along the y axis: Temperature ("CIF) along the "x axis. The curved ine indicates Maximum Specific Humidity: the point at which an air mass has reached Saturation and Relative Humidity-100% Study the gaph carefuly and answer the questions provided. Estimate values that fall between gridlines as precisely as you can. Be sure and include the correct units of measurement in all answers! Graph 1: Specific Humidity, Maximum Specific Humidity and Temperature 60 20 10 C -40-30 -2010 0 10 20 30 40 50 6F -40-20 0 20 40 60 80 100 120 Temperature 1. As you can see, there are three points indicated on the curve. Based on the X axis, these points correspond to temperatures of 1, 20, and 40 degrees Celsius (C). What is the Maximum Specific Humidity (MSH in g/kg) at each of these temperatures?

Explanation / Answer

Specific Humidity is the ratio of the water vapour to dry air in a particular mass, and is sometimes referred to as the humidity ratio. Specific humidity ratio is expressed as the ratio of grams of water vapour per kilogram of dry air.

Now when the atmosphere is completely saturated with water vapor to its maximum possible extent, the specific humidity is at its highest limit under a given pressure and temperature. This highest value of specific humidity is the saturation specific humidity or maximum specific humidity.

Case 1: When temperature is 1 degree Celsius the MSH is 4 g/Kg (draw a horizontal line on y axis which meets the y axis just below 5)

Case 2: When temperature is 20 degree Celsius the MSH is 19.5 g/Kg

Case 3: When temperature is 40 degree Celsius the MSH is 46 g/Kg

The specific humidity increases as temperature increases i.e. the warm air has higher capacity to absorb water vapour. Thus the maximum specific humidity also increases with temperature of the air body.