Hello Sanika,

Liquids and gases are collectively known as fluids as they have no definite shape and take the shape of the container in which they are filled with.

There are many properties of ideal fluids. Some of the properties are as follows:

1. Incompressibility

2. Bulk modulus

3. Viscosity

4. Surface tension

5. Irrotational flow

Hope it helps.

Good Luck!