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
Its nearly impossible to create a perfect vacuum.
Lets imagine that the vacuum pump leaves 1% air in the tank. Now when he fills it again with argon it will mix with the air and become a mixture of 99% argon and 1% air. Now he turns on the pump again it will leave 1% of the mixture in the tank which means there is only 0.01% air and 0.99% argon in the tank. Now he just needs to repeat this until there is as little air as he wants.
Eli5 version:
When youre brushing your teeth and you spit out the toothpaste it will leave a taste in your mouth but its hard to spit out the last remains. Thats why you rinse your mouth with water and the water takes out some of that toothpaste each time and you have to repeat it couple times to get the taste out fully.
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