Paramagnetic substances and magnetic susceptibility:
Paramagnetic substances are materials that are weakly attracted to magnetic fields. When placed in a magnetic field, these substances align their magnetic dipoles with the external field, resulting in a net magnetization. The extent to which a material can be magnetized is quantified by its magnetic susceptibility.

Explanation:

Small and positive:
- Paramagnetic substances have a small positive magnetic susceptibility.
- This means that they exhibit a weak response to magnetic fields compared to ferromagnetic materials.
- The positive value indicates that the material is attracted to the magnetic field, but the effect is relatively weak.
- The small value indicates that the magnetization of the material is not as strong as in ferromagnetic substances.

Comparison with other substances:
- In contrast to ferromagnetic materials, which have a large positive magnetic susceptibility, paramagnetic substances show a much weaker response.
- Diamagnetic materials, on the other hand, have a small negative magnetic susceptibility, meaning they are weakly repelled by magnetic fields.

Significance:
- Understanding the magnetic susceptibility of paramagnetic substances is crucial for various applications in physics, chemistry, and materials science.
- By studying the behavior of these materials in magnetic fields, researchers can gain insights into their magnetic properties and potential uses in technology.
In conclusion, the magnetic susceptibility of a paramagnetic substance is small and positive, reflecting its weak attraction to magnetic fields compared to other types of materials. This characteristic is essential for understanding the magnetic behavior of paramagnetic substances and their potential applications.