Helium can be purchased at distributors of specialty gases. For example, Nanjing Liquefied Gas Company.
Also you can go to the factory that produces helium to buy it directly. Wuhan NewRock Specialty Gases, which has a large amount of helium for sale all year round, can meet your gas needs.
Because helium is not a household product, it is not suitable to be found in major stores in real life, and customers who need helium, such as helium balloons, wedding companies, etc., don't know where to go to buy helium, because helium is an inert gas, non-combustible, non-explosive, and is safer and more reliable than hydrogen, but the price is a little more expensive.
Because of the low temperature of liquid helium, when certain metals or metal compounds are cooled with liquid helium, the resistance of the metal or metal compound disappears completely, a phenomenon known as superconductivity, and this temperature is called the critical temperature.
Because helium transmits sound almost three times as fast as air, a person who inhales helium speaks at a higher frequency. This interesting phenomenon makes people who inhale helium speak in a shrill voice, as if they were old-time cartoon characters.
Applications of helium:
Low-temperature cooling sources utilize liquid helium's low boiling point of -268.9°C. Liquid helium can be used for ultra-low-temperature cooling. And the ultra-low temperature cooling technology has a wider application in the field of superconductivity technology, etc. Superconducting materials need to be in low temperature (around 100K) to show superconducting properties, and most of the time only liquid helium can realize such very low temperature in a relatively easy way.
Superconducting technology is used in the transportation industry for magnetic levitation trains and in the medical field for nuclear magnetic **** vibration imaging equipment. Balloon inflation due to helium is much less dense than air (the density of air is 1.29kg/m3, helium's density is 0.1786kg/m3), and is chemically extremely inactive, safer than hydrogen Hydrogen can be combusted in the air, which may cause an explosion.