diameter(pipe)=0.1m

diameter(throat)=0.05m

difference in pressure=55kpa

Cd=0.98

question requires me to find the volume flow rate.

1)i know i need to find h(diff in pressure/density*gravity)

i have a doubt here where can i just leave the pressure in kpa or must i change it to pa??

2)from there i know i can find volume flow rate=sq root of [ (2gh)/ (A1/A2)^2 -1],where A1=surface of pipe and A2=surface area of throat(this formula is where my doubt lies in cause i have seen other variations!!is this formula correct in the 1st place)

3)finally Q (actual)= Q (theor)*Cd

i am not quite sure of what i am doin in step 2 is correct because i have come across another formula in which Q= Cd*surface area(throat)*sq root of (2gh)!!but while i use this formula my ans are not the same!!can someone help me with doubt.