Conservation Equations in Integral Form

Deriving Conservation Equations From the Laws of Physics

Fluids, being matter, must obey the laws of Physics. The ones we need are:
1. Conservation of Mass: Mass is neither created nor destroyed (nor changed to anything else)

2. Newton's Laws of Motion –
•1st Law: concept of equilibrium
•2nd Law: force, acceleration, momentum
•3rd Law: action & reaction
Conservation of Energy -- 1st Law of Thermodynamics
These must be valid for all flow problems that we
consider. http://abyss.uoregon.edu/~js/images/relativistic.jpg
They might need modification if the flow is inside a
star or a Black Hole, where there may be substantial
conversion between matter and energy
Also, for problems involving spacecraft (or atoms or
subatomic particles) accelerating to speeds close to that of light.

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