Look at the photo below. The person should not aim directly at the fish if he want to catch it. Explain your knowledge of properties of light. Be sure to use the terms: transmission, air and water in your answer.
Steam enters an adiabatic diffuser at 150 kpa and 1208c with a velocity of 550 m/s. determine the minimum velocity that the steam can have at the outlet when the outlet pressure is 300 kpa.