Oxygen is MAGNETIC?!

In this Physics Girl video, Dianna explores the fascinating behavior of liquid oxygen in a magnetic field at MIT. The demonstration showcases how liquid oxygen, a paramagnetic material, aligns with an external magnetic field, unlike other liquids. The video also explains the concepts of electromagnets, paramagnetism, and ferromagnetism, using iron to demonstrate the Curie point. The video concludes with a preview of future demonstrations and a thank you to the MIT technical services group.

What was the unique behavior of liquid oxygen observed in the experiment?

• It evaporated instantly.

• It changed color.

• It hung between magnetized metal pieces.

• It froze immediately.

How is a magnetic field created using electromagnets?

• By using permanent magnets.

• By passing DC current through coils.

• By passing AC current through coils.

• By cooling the metal.

Why doesn't liquid nitrogen hang between the magnetized metal pieces like liquid oxygen?

• It has no surface tension.

• It evaporates too slowly.

• It reacts too quickly with the metal.

• It doesn't respond to magnetic fields.

What property allows liquid oxygen to align with an external magnetic field?

• Superconductivity

• Diamagnetism

• Paramagnetism

• Ferromagnetism

What happens to the mini magnets in paramagnetic materials when the external magnetic field is turned off?

• They disappear.

• They point in random directions.

• They align in the opposite direction.

• They remain aligned.

What is the Curie point of iron?

• Around 1500 Kelvin

• Around 2000 Kelvin

• Around 1043 Kelvin

• Around 500 Kelvin

What happens to iron's magnetic properties when it is heated past the Curie point?

• It becomes a superconductor.

• It changes color.

• It loses its magnetism.

• It becomes more magnetic.