What are the two criteria necessary for a substance to be considered a magnet

The substance;

- must possess poles (north and south)

- exhibit force of attraction and repulsion i.e obeys law of magnetism)

Explanation:

For a substance to be considered a magnet, such magnet must be able to attract metallic objects to itself when placed in a magnetic field.

The substance must possesses free north and south poles at its ends because magnets generally possesses both the force of attraction and repulsion which is dependent on the nature of the poles of the magnetic substances coming together. Like poles of magnets (same poles) are known to repel each other while unlike poles (different poles) of magnets attracts each other

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explanation:

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gas and liquid