Medical treatment
Xenon has a highultraviolet radiation and can be used in medical technology. Xenon can dissolve in the oil of the cytoplasm, causing the cell to numb and swell, so that the nerve endings are temporarily stopped, to achieve anesthesia. A mixture of 80% xenon and 20% oxygen has been tried as an anesthetic without side effects. Isotopes of krypton and xenon are also used to measure cerebral blood flow.
Artificial air
Helium is mixed with oxygen to make artificial air that divers can breathe. Because in the deep sea with greater pressure, breathing with ordinary air, there will be more nitrogen dissolved in the blood. When the diver rises from the deep sea and the body gradually recovers normal pressure, the nitrogen dissolved in the blood should be released to form bubbles, causing blockage to the microvessels and causing “gas congestion”. Helium is much less soluble in the blood than nitrogen, and replacing ordinary air with a mixture of helium and oxygen (artificial air) will not cause the sergeant phenomenon.
Aeration
Helium is the lightest gas in addition to hydrogen, which can not burn and does not support combustion, and hydrogen is flammable and explosive, and now helium has been used instead of hydrogen to fill balloons and gas boats.
Hypothermy
Liquid helium has a boiling temperature of -269 ° C, which is the most difficult of all gases to liquefy, and ultra-low temperatures close to absolute zero (-273.15 ° C) can be obtained by using liquid nitrogen. Liquid helium at temperatures above 2.2K is a normal liquid with the commonness of a general liquid. Liquid nitrogen at temperatures below 2.2K is a superfluid with many anomalous properties. For example, it has superconductivity, low viscosity, etc. Its viscosity becomes one-hundredth that of hydrogen, and the liquid helium can flow up the inside of the container and slowly down the outside of the container. This phenomenon is of great significance for the study and verification of quantum theory.
Post time: Nov-26-2024