Why magnet can attract liquid oxygen but not aluminium?both paramagnet

In summary, paramagnetism is the property of certain materials to become weakly magnetized in the presence of an external magnetic field due to the presence of unpaired electrons. This makes them attracted to a magnet, such as in the case of liquid oxygen. However, temperature has a direct influence on paramagnetism, which explains why aluminium, which is considered paramagnetic, may not be attracted to a magnet at certain temperatures. This is known as Curie's law.
  • #1
Outrageous
374
0
A magnet only attract ferromagnetic material because they have magnetic domains which will align to form magnetic dipole when external magnetic field applied.
Paramagnet don't have domains. Due to the presence of some unpaired electron, they will cause the realignment of the electron path when external magnetic field applied.
So they should be attracted by magnet also, eg liquid oxygen.
But why not aluminium ? is that because of the temperature or the mass of the paramagnetic material?
Thank you
 
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  • #2
hi there

interesting question ... I was unaware that LOX was paramagnetic till now
here's one link to a site showing some easy to do experiments.

Yes it is to do with the unpaired electrons see this site

Aluminium is deemed paramagnetic see this link to Wiki

cheers
Dave
 
  • #3
Temperature has a direct bearing on paramagnetism. See Curie's law.
 
  • #4
Outrageous said:
A magnet only attract ferromagnetic material because they have magnetic domains which will align to form magnetic dipole when external magnetic field applied.
Paramagnet don't have domains. Due to the presence of some unpaired electron, they will cause the realignment of the electron path when external magnetic field applied.
So they should be attracted by magnet also, eg liquid oxygen.
But why not aluminium ? is that because of the temperature or the mass of the paramagnetic material?
Thank you

Are you perhaps confusing paramagnetism with Eddy currents?
 
  • #5
for your question. The reason why a magnet can attract liquid oxygen but not aluminium is due to the differences in their magnetic properties. As you mentioned, both liquid oxygen and aluminium are paramagnetic materials, meaning they have unpaired electrons that can be influenced by an external magnetic field. However, the strength of their magnetic properties varies.

In the case of liquid oxygen, it has a stronger paramagnetic effect due to its low boiling point and therefore, its molecules are more easily affected by external magnetic fields. This allows the liquid oxygen to be attracted to a magnet.

On the other hand, aluminium has a weaker paramagnetic effect due to its higher boiling point and the stronger bonds between its atoms. This makes it less likely to be influenced by an external magnetic field, resulting in a weaker attraction to a magnet.

Therefore, it is not due to the temperature or mass of the paramagnetic material, but rather the strength of its magnetic properties that determines its attraction to a magnet. I hope this explanation helps to clarify your question.
 

Related to Why magnet can attract liquid oxygen but not aluminium?both paramagnet

1. Why can a magnet attract liquid oxygen?

Liquid oxygen is composed of molecules that have unpaired electrons, making it paramagnetic. This means that the molecules can be temporarily magnetized in the presence of a magnetic field, allowing them to be attracted to a magnet.

2. Why can't a magnet attract aluminium?

Aluminium is a non-magnetic material, meaning that its atoms do not have unpaired electrons and cannot be magnetized. Therefore, a magnet does not have any effect on aluminium and cannot attract it.

3. How does the magnetic field interact with liquid oxygen?

The magnetic field from a magnet causes the unpaired electrons in the liquid oxygen molecules to align in the same direction, creating a temporary magnetic field. This temporary magnetic field interacts with the magnet's field, resulting in attraction between the two.

4. What happens when a magnet is brought close to liquid oxygen?

As a magnet is brought closer to liquid oxygen, the molecules in the liquid begin to align with the magnet's field. This alignment creates a temporary magnetic field in the liquid, causing it to be attracted to the magnet.

5. Can other materials besides oxygen be attracted to a magnet?

Yes, other materials with unpaired electrons, such as iron, nickel, and cobalt, can also be attracted to a magnet. These materials are known as ferromagnetic materials and have a much stronger magnetic response compared to paramagnetic materials like liquid oxygen.

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