When you put your thumb over the end of a garden hose, the water shoots out faster. Why? The same flow rate must exit a smaller hole – so speed increases. That’s the (matter is neither created nor destroyed).
: Often called a fluid's "thickness." It measures resistance to flow. For example, honey has high viscosity, while water has low viscosity. Density : The amount of mass in a specific volume ( fluid mechanics for dummies pdf
If you are just starting, these are the primary pillars of the subject: Fluid Statics When you put your thumb over the end