Thermodynamics: It is not always possible or practical tomeasure a thermodynamic property directly. In the three followingsituations, select the measurements that are necessary to obtainthe desired property. Use as few measurements as possible to getfull credit. Justify your answers briefly.

1. You want to find the pressure inside a small tank of R134arefrigerant that you found in your lab. Assume the tank is entirelyfilled with refrigerant in liquid and vapor states. The system isat equilibrium. To this end you need to measure:

(a) Temperature inside the tank

(b) Total volume of refrigerant in the tank,

(c) Volume of liquid inside the bottle,

(d) Mass of liquid inside the tank.

2. You want to find the specific volume of an air-fuel mixture(modeled as air in a gaseous state) entering a gas turbine. To thisend you need to measure:

(a) Temperature of the air-fuel mixture,

(b) Pressure of the air-fuel mixture,

(c) Mass flow rate of the air-fuel mixture,

(d) Speed of the air-fuel mixture.

3. Consider ice and liquid water in a glass sitting on yourkitchen counter. You want to find the water level in the glass atthe instant when the last piece of ice melts. The geometry of theglass is known. To this end you need to measure:

(a) Pressure in the kitchen,

(b) Temperature in the kitchen,

(c) Mass of ice,

(d) Mass of water (liquid and ice