I just recently started a basic module of physical chemistry in school and I am having a hard time with this one question. Could you please help me? ^^

**Question:**

An orifice meter is used to measure the rate of fluid in pipes. The flow rate is related to the pressure drop by the following equation:

u = c * sqrt( delta P / ρ )

Where,

u is the velocity,

delta P is the pressure drop ( force per unit area ),

ρ is the density, and

c is a constant.

What are the units of c in SI system of units?

**Ans: 1**

I'd really appreciate an explained and worked out solution if possible.

Thanks in advance!