Which condition suggests that a change from fair to stormy weather is most likely on the way
a. constant air pressure
b. decreasing air pressure
c. decreasing wind speed
d. increasing air pressure

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.