Fixed Volume but No Fixed Shape

The substance that has a fixed volume but no fixed shape is milk.

Explanation:

Fixed Volume:
- A substance with a fixed volume means that it occupies a specific amount of space and does not change its volume easily.
- This means that no matter the container it is placed in, the substance will maintain the same volume.

No Fixed Shape:
- A substance with no fixed shape means that it can change its shape easily.
- This means that the substance does not maintain a specific form and can take the shape of its container.

a) Water vapor:
- Water vapor is the gaseous form of water.
- It does not have a fixed volume since it can expand or contract to fill the available space.
- It also does not have a fixed shape since it takes the shape of its container.

b) Salt:
- Salt is a solid substance.
- It has a fixed volume since it occupies a specific amount of space and does not change its volume easily.
- It also has a fixed shape, maintaining its crystalline structure.

c) Milk:
- Milk is a liquid substance.
- It has a fixed volume since it occupies a specific amount of space and does not change its volume easily.
- However, it does not have a fixed shape since it takes the shape of its container.

d) Ice:
- Ice is the solid form of water.
- It has a fixed volume since it occupies a specific amount of space and does not change its volume easily.
- It also has a fixed shape, maintaining its crystalline structure.

Therefore, the substance that has a fixed volume but no fixed shape is milk.