## PropellantMass:

Path: SC/Actuator

```% Compute the propellant mass and pressurant mass for a tank.

The following equation is used:
p = R*( mPressurant*T )/(V-mFuel/rhoFuel )

where p is the pressure, R is the gas constant of the pressurant, V is the
tank volume, and rhoFuel is the density of the fuel.

The mass of the pressurant is found by setting p=pMin and mFuel=0.
The total mass of the fuel is then found by solving the above equation
for "mFuel".

Helium gas constant:		2079 J/(kg*K)
Hydrazine density:   		1010 kg/m^3
Convert PSI-to-metric: 	1 PSI = 6895 N/m^2
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Form:
[mFuel,mPressurant] = PropellantMass( V, R, T, rhoF, pMax, pMin );
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------
Inputs
------
V        	Tank volume (m^3)
R          Gas constant of pressurant (J/kg/K)
T       	Temperature (K)
rhoFuel		Density of fuel (kg/m^3)
pMax    	Maximum pressure (N/m^2)
pMin       Minimum pressure (N/m^2)

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Outputs
-------
mFuel         Mass of the propellant (kg)
mPressurant   Mass of the pressurant (kg)

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```

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