This is the fluid flow (volume per unit of time).
Liquids flow because they have the ability to resist compression. The rate at which it flows depends on the viscosity of the liquid.
A check valve is used to adjust a flow rate of a fluid, making sure that the liquid flows in one direction.
Changing the length of the input tube for a liquid in surface tension affects the rate at which the liquid flows. A longer tube may increase the flow rate as there is higher pressure due to increased height. This can lead to faster filling or emptying of the container.
Viscosity
IRR assumes that all cash flows are reinvested at the project's rate of return, seldom a defensible assumption. Since NPV discounts future cash flows at the investor's cost of capital, it more accurately represents the value of a project. It assumes that cash flows are reinvested at the cost of capital. This is a good assumption so long as the financing can be repaid in stages so as to reduce interest or equity cost. MIRR enables a project to be described with the simplicity of a percentage rate of return, as with IRR, but does not assume that cash flows can be effectively reinvested in the project at the calculated rate of return. Instead, cash flows are assumed to be reinvested at any given rate, such as a bank interest rate.
liquid.
it just flows
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Liquid flows because of its viscosity.
One can describe how a liquid pours by its viscosity. Viscosity is a liquid's ability to resist flow. Therefore, the higher the viscosity, the "thicker" the liquid is and causes it to pour out slowly. If a liquid is said to have a low viscosity, the liquid is "thinner" and can easily be poured out.
If a liquid flows easily, it has low viscosity. Viscosity is a measure of a fluid's resistance to flow; low viscosity means the fluid flows easily, while high viscosity means it flows more slowly.