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
Breathe in. It’s pretty easy for your lungs to get air in, right? Now put a cup around your lips to make a seal and try to breathe in. It’s a lot harder, isn’t it? There’s still air in the cup, but you can’t suck it all out with your lungs.
When there’s less air around, it’s harder to “suck” the air out of an area. So, the more you suck out, the harder and harder it becomes to suck. You eventually need to get different machines in order to keep “sucking” the air up, and that’s expensive.
So, instead of trying to suck harder, in the video they just make it easier to suck! The argon gas they pump in is a gas, but it doesn’t do anything, unlike oxygen which can cause things to burn. So now it’s easier to suck, and they can keep doing it. Eventually, the argon washes away all the oxygen, like how when your hands are muddy you can wash away the mud; at first there’s a lot of mud in the water, but eventually it’s just water in and water out, and you know all the mud’s off.
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