Matter that has a fixed volume and an uncertain shape
The answer is: Liquid.
Realistic data indicates that there are different types of materials with different properties.
Matter has a fixed volume, but its shape is not fixed.
This state is known as the liquid state.
For example, juices can take any shape or size depending on the container they are placed in, but their overall volume does not change.
Even when there is external pressure, the volume of the liquid substance remains constant.
This classification of materials is suitable for use in various process methods, such as applying high pressure or extreme heat, and is used in many different industries.