Paramagnetism in Air Exhibits

Paramagnetism is a phenomenon in which a material is weakly attracted to an external magnetic field. This property is exhibited by materials that have unpaired electrons in their atomic or molecular orbitals. Air is a non-magnetic substance, but it exhibits paramagnetism under certain conditions.

Molecular Oxygen in Air

The main reason for the paramagnetism of air is the presence of molecular oxygen (O2) in the atmosphere. Oxygen molecules have two unpaired electrons in their outermost orbitals, which makes them weakly attracted to an external magnetic field.

The magnetic moments of the individual oxygen molecules in air are randomly oriented in the absence of an external magnetic field. However, when an external magnetic field is applied, the magnetic moments align themselves with the direction of the field, resulting in a weak attraction of air towards the field.

Temperature and Pressure

The extent of paramagnetism exhibited by air depends on the temperature and pressure of the gas. At higher temperatures, the thermal energy of the molecules overcomes the weak magnetic attraction, and the paramagnetism decreases. Similarly, at higher pressures, the molecules are closer together, and the interactions between them reduce the paramagnetic effect.

Applications

The paramagnetism of air has various applications in scientific research and technology. It is used in magnetic resonance imaging (MRI) to create high-resolution images of the human body. The paramagnetism of air is also used in the measurement of magnetic fields and in the separation of isotopes.

Conclusion

In conclusion, air exhibits paramagnetism due to the presence of molecular oxygen in the atmosphere. The paramagnetic effect of air depends on the temperature and pressure of the gas and has various applications in scientific research and technology.