Problem 3: Viscosity of air [11]

Below is the viscosity of air (in µPa*s) at various temperatures and pressures.

a. [5] Plot the viscosity vs. Temperature at P = 0.1 MPa and P = 10 MPa on the same plot.

Viscosity is given in µPa*s. Data is taken from CRC Handbook. Carefully label both

axes including units. Since this is data, the graph should have points. A straight line

segment may be used to connect the points if it helps in visualizing the data. Make sure

to include a legend also.

b. [3] Explain in words why the viscosity of a gas increases with an increase in

temperature.

c. [3] Will viscosity of a liquid increase or decrease with temperature? Explain.

T(K)

100

200

300

400

500

600

700

800

900

1000

P = 0.1 MPa P = 10 MPa

7.107

13.33

18.537

23.06

27.090

30.77

34.176

37.37

40.394

43.28

18.16

20.64

26.29

28.19

31.67

34.94

38.04

40.99

43.81