#### Dimensionless numbers in fluid mechanics and their significance

The important dimensionless numbers in fluid mechanics are

- Reynold’s number
- Froude’s number
- Weber’s number
- Euler’s number
- Mach’s number of Cauchy’s number

**Reynold’s number : It is the ratio of inertia force to the viscous force.**

**Froude’s number : It is the ratio of inertia force to the gravity force.**

**Weber’s number : It is the ratio of inertia force to the surface tension force.**

**Euler’s number : It is the ratio of inertia force to the pressure force.**

**Mach’s number of Cauchy’s number : It is the ratio of inertia force to the elastic force.**