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21. Which of the following will have the largest interfacial area per unit volume?

A. A bubble with a diameter of 1 mm
B. A bubble with a diameter of 5 mm
C. A bubble with a diameter of 15 mm
D. A bubble with a diameter of 50 mm

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22. Which device is commonly used for measuring the rate of rotation (rpm) of the stirrer shaft?

A. Anemometer
B. Manometer
C. Tachometer
D. Barometer

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