I just watched this (https://youtu.be/jLX1-tNnvEo?t=897)(14:57) and the guy in the video used vacuum and argon gas to remove any oxygen from the melter but I don’t understand why is the argon used if you are already vacuuming all the air out anyway?
In: Chemistry
ELI5: you have a glass full of mud (oxygen/moisture) and you want to use the glass to make untainted lemonade (whatever the science experiment is). so you pour out the mud, fill it with water (argon gas), dump, rinse and repeat until theres no mud left. Now you have a glass with water in it and hopefully no mud that you can use to make your lemonade.
Seems like the final goal was have a chamber with no oxygen or moisture. He doesnt leave the chamber in a vacuum state (he closes the vacuum and argon valves but the pressure meter is nominal not negative) but instead filled with as high concentration of argon as he can that wont interfere with what hes doing. He’s essentially rinsing the chamber of oxygen and water using the argon
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