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# Gravitational Acceleration2

## Gravitational Acceleration

(OP)
I am trying to figure out an equation in an old engineering document.

Dynamic Head: H = 1/2 ϱ V2

The wacky looking Greek character is called &varrho; in HTML, and \varrho in LaTeX, which I interpret to be a variation on the character roh, ρ. The only thing that makes any sense to me is that...

ϱ = 1/g, where g is acceleration due to gravity.

Has anybody seen anyone do this? Have you done this anywhere?

--
JHG

### RE: Gravitational Acceleration

I've always thought of that as "rho" ... being mass density (in dimensions, M/L^3). Then together with V^2 (L^2/S^2) you get M/(L*S^2) or forcepressure. (oops)

### RE: Gravitational Acceleration

The equation has the same form as aerodynamic drag, which results in a pressure unit, if area is not included. I think &varrho and rho are the same thing.

https://www.grc.nasa.gov/www/k-12/airplane/drageq....

TTFN (ta ta for now)
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### RE: Gravitational Acceleration

Just fluid density for the equation for dynamic pressure. Someone must have like the shape of that character or thought it was more distinct from "p". By hand I use the curly version.

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