2

Liquid oxygen is magnetic

Liquid oxygen sticks between the poles of a strong magnet until it boils away into its gas state. This is because it has unpaired electrons, which make each oxygen molecule a tiny magnet with a dipole. Normally, when oxygen is in a flask or in the air, these microscopic magnets point in all directions, cancelling out and meaning that there’s no net magnetic field. When it pours over the permanent magnet, the magnetic molecules all slightly align, creating an induced magnetic field, which reacts with the permanent magnet, making the oxygen stick to the poles. This is called paramagnetism. Click here to watch the video.

Atlantic ‘Dead Zones’ Could Cause Mass Fish Kills

Scientists have discovered what are called “dead zones” in the tropical North Atlantic, and they could potentially lead to mass fish kills, according to new research.

Dead zones are areas of the ocean with extremely low levels of oxygen. Most marine animals, like fish and crabs, cannot live within these regions, where only certain microorganisms can survive. These zones not impact the environment, but also are an economic concern for commercial fishing. For example, very low oxygen concentrations having been linked to reduced fish yields in the Baltic Sea and other parts of the world.

And now, several hundred kilometers off the coast of West Africa, a team of German and Canadian researchers have discovered the lowest oxygen levels ever recorded in Atlantic open waters.

“Before our study, it was thought that the open waters of the North Atlantic had minimum oxygen concentrations of about 40 micromole per liter of seawater, or about one milliliter of dissolved oxygen per liter of seawater,” lead author Johannes Karstensen, a researcher at GEOMAR, the Helmholtz Centre for Ocean Research Kiel, in Kiel, Germany, said in a statement.

Although this concentration of oxygen is low, most fish can still survive in such waters. However, this latest study shows that the minimum levels of oxygen are actually about 20 times lower than the previous estimate, making the dead zones nearly void of all oxygen and unsuitable for most marine animal

2

Paramagnetism of Liquid Oxygen

In the triplet form, O2 molecules are paramagnetic. That is, they impart magnetic character to oxygen when it is in the presence of a magnetic field, because of the spin magnetic moments of the unpaired electrons in the molecule, and the negative exchange energy between neighboring O2molecules.

Liquid oxygen is attracted to a magnet to a sufficient extent that, in laboratory demonstrations, a bridge of liquid oxygen may be supported against its own weight between the poles of a powerful magnet.

Giffed by: rudescience  From: This video