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for $y = f(x_1, ..., x_n)$, the sum of the partial differentials with respect to all of the independent variables is the total differential: $$dy = \frac{\partial y}{\partial x_1}dx_1+...+\frac{\partial y}{\partial x_n}dx_n$$ For our case: $$\dot{m} = \rho Av$$  d\dot{m} = \frac{\partial \dot{m}}{\partial \rho}d\rho + \frac{\partial \dot{m}}{\partial A}...

3

the conservation of mass equation $\dot m = \rho A V$ may be differentiated to obtain $A V d\rho + \rho V dA + \rho A dV = 0$ Which upon division by $\rho A V$ yields $0 = \frac{d\rho}{\rho} + \frac{dA}{A} + \frac{dV}{V}$. The method for the first step is "partial derivatives". Explaining this method is outside the scope of the question I ...

1

According to New Atlas, a solar power plant went online in 2009. The principles are similar to your diagram, but simpler. Mirrors (not lenses) redirect sunlight to a single point atop a tower, which converts water to high pressure steam. The steam is used to spin turbine generators, located on-site. The expended steam is thereby cooled and condensed and used ...

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