can someone help me with this economics question above please if your right i will give you points (brainlist)

Astate of matter all that has define volume and can flow is a(n)

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

In a system, when potential energy decreases, then entropy also decreases. true false