1. A rotameter is available with several bobs of variable densities. If the meter will be used for measuring the flow of liquid ammonia at 20?C, what density of bob would you select?
2. An airflow of about 1.5 kg/s at 20 atm and 50?C (stagnation conditions) is to be measured using a sonic nozzle. What exit diameter should be designed for the nozzle?