![]() Simply put, it is necessary to surround the superconductor with cooled liquid helium to allow electric current to pass through the superconductor, creating a strong magnetic field, in order to obtain high-resolution images of internal organs.Īnother important area of helium refrigeration is aerospace. Superconductor imaging is required in nuclear magnetic resonance imaging, which requires extremely low temperatures to achieve a resistance of 0. Medical nuclear magnetic resonance requires the refrigeration function of helium. It only becomes liquid when extremely close to absolute zero (- 273.15 ℃ below zero) and does not solidify. Helium is also the gas with the lowest boiling point, reaching - 268.93 ℃ below zero. Mixing helium and oxygen reduces the pressure inside the oxygen tank, creating a suitable gas density, allowing divers to easily inhale oxygen and avoid the occurrence of "decompression sickness.". At this time, if they inhale oxygen with strong density and pressure from an oxygen bottle, it can pose great danger to the human body.". "Divers are exposed to much greater pressure in the sea than on land, and are prone to symptoms of dizziness and difficulty breathing. Helium is used to add to oxygen tanks as a pressure reducing agent. Stability gives it many uses that hydrogen cannot do. We often hear the term "hydride", but there has never been a term for "helium". It is neither easily soluble in water nor rarely reacts with other elements. Helium is also an inert gas with very stable chemical properties. Therefore, it is also classified as a non renewable resource. Due to its light weight, helium can easily escape into the atmosphere and cannot be reused by humans. Helium, also known as a rare gas, is very rare, accounting for only about 0.0005% of the volume of air. People still refer to it as "hydrogen balloon" just out of habit. In fact, the correct name for a hydrogen balloon should be called "helium balloon," which is also filled with helium. When it comes to #helium, it may not be familiar, but when it comes to " #hydrogenballoons," it's different.
0 Comments
Leave a Reply. |