A fluid is any gas or liquid or any other material which cannot sustain any tangential nature or any sort of force when it is at rest it undergoes continuous change in shape when it has a subject of stress acquainted to it. **Fluid** is typically a material that has a flow under force. A flow in the open channel means the flow of any fluid in the form of liquid which is done through a passage or a type of channel through an open surface and that’s why it is known as flow in an open channel. **Flow in open channels example** is the flowing of rainwater in the sewage of the houses.

**Principles of fluid**

The study of **fluid**s in the branch of science states that there is a very important subjective regarding chemical engineering and mechanical engineering. The basic principles of fluid mechanics are the continuing equation which is also known as the conservation of mass following to that is the momentum principle which is the conservation of momentum and lastly, one of the most important principles of **fluid** is the energy equation which is related to the Bernoulli’s equation as well which derives the motion of equations. The principle of momentum equation in **fluid** states that the change of the momentum of the flux is gradually equal to the sum of every force which are applied to the fluid and if the control volume is considered then the advantage lies on the volume of the surface of the control which is also perpendicular to the direction in which the fluid is flowing. Bernoulli’s equation is also a very smooth transition that can be applied on the fluids where it makes it a very incompressible and a frictionless floor and hydrostatic pressure distributes itself at a very uniform velocity which continues the equation of Bernoulli at a horizontal channel and the **fluid** flows very smoothly.

**Flow in open channels **

**Flow in open channels **means the flowing of the fluid in a form of liquid which can be done through a type of a channel which is the passage that has an open surface and the passing of the fluid is done in a very smooth manner and that is the reason it is known as flow in an open channel. **Flow in open channels** is always the free surface which is related to the streamline and the time is always constant to the pressure on the driving force of the motion of the fluid and the motion of the water is in a practical situation. **Flow in open channels example** is the passing of water or rainwater through the sewage of the houses.

**Flow in open channels formula**

**Flow in open channels** is usual to the atmospheric pressure and the driving force of the motion of the fluid is flowing through the gravity and the water is flowing at practical situation whether incompressible fluid which can be water has a study following condition. So in this case **Flow in open channels formula** is

**Q = V****1**** A****1 ****= V****2****A****2**

In this situation, the total volume which is discharged is represented as Q while V is the flow of velocity across the sections of A and the 1 and 2 eventually refer to the downstream and upstream locations of the **fluid**.

**Conclusion**

The basic equations of **fluid** mechanics are the mathematical expressions that can be fundamental in the continent theory. In this situation, the fluids are also accepted as a result of experiments across the physical world and one of the most important tasks is to predict the responsiveness of the external effect of the **fluid** across the surrounding area. The basic principles which lie, continue the models of the constructed matter which are the balance of momentum conservation of mass and also the balance of angular momentum which conserves energy and balances the equations regarding the internal and the kinetic energy. These are some of the most consistent models of **fluid.**