__FLUID__》Fluid is a substance that flows under the action of shearing forces

》If a fluid is at rest, then forces on it are in balance.

》A gas is a fluid that is easily compressed. It fills any vessel in which it is contained.

》A liquid is a fluid which is hard to compress.

__FLUID PROPERTIES__**~Pressure**:-

》It is force per unit area , where force is perpendicular to the area.

**1. Mass density**:-

》It is mass per unit volume.

**2. Specific weight**:-

》It is weight of fluid per unit volume.

**3. Specific volume**:-

》 It is defined as volume per unit mass.

**4. Specific gravity:-**

》It is defined as the ratio of weight density (or density) of a fluid to the weight density (or density) of standard fluid.

》The standard liquid is water & standard gas is air.

》It is a dimensional quantity.

**5. Viscosity - Dynamic viscosity:-**

**》**It is defined as the property of fluid which offers resistance to the movement of one layer of fluid over another adjacent layer of the fluid.

**6. Kinematic viscosity :-**

**》**It is the ratio of two physical properties of fluid.

》It is defined as the ratio between the dynamic viscosity & density of a fluid.

__CLASSIFICATION OF FLUIDS__**1. Ideal fluid**

**2. Real fluid**

**3. Newtonian fluid**

**4. Non - Newtonian fluid**

**5. Ideal plastic fluid**

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