Generally speaking from a physics perspective, using the method of pressing the cap on with the holes closed will impart a positive pressure in the tank. As soon as you open the feed holes, the pressure will equalize. This has to happen due to open channels. The fact that you start drawing on it creates a negative pressure on the inside of the Killer by the feed holes. juice gets sucked in due to this, but also air goes into the tank. This is why you see bubbles. It's all because the pressure has to equalize.
So realistically, the only "benefit" to using the push-in cap method of filling is to build a positive pressure which forces juice in when you open the holes. This could lead to initial flooding it there's too much pressure built up. An example of this would be if the end caps take up a lot of space in the tank. The more space the caps displace, the more pressure will build up when it's pressed in. Something like an IBTank, though, won't build as much pressure as the caps are thin.
Now, if you use a fill hole, firstly, you should definitely close the feed holes. Most likely, the needle will be coated with a little juice which almost perfectly plugs up that hole so no air can escape. With a top fill hole screw; If the feed holes are open, juice will force itself into the atty and flood it. Again this is due to the tank wanting to have equalized pressure.
This is the good thing about the Rapid Tank. Its fill hole is at the bottom. So turning it upside down, the feed holes can be open. When you inject juice, air will go into the feed holes (equalizing pressure), but nothing will happen otherwise. When you plug the hole and get ready to vape, it'll be fine as you again have equal pressure in the tank.
I'm not a physicist, but an electrical engineer, which required way too many physics classes for my liking.
So realistically, the only "benefit" to using the push-in cap method of filling is to build a positive pressure which forces juice in when you open the holes. This could lead to initial flooding it there's too much pressure built up. An example of this would be if the end caps take up a lot of space in the tank. The more space the caps displace, the more pressure will build up when it's pressed in. Something like an IBTank, though, won't build as much pressure as the caps are thin.
Now, if you use a fill hole, firstly, you should definitely close the feed holes. Most likely, the needle will be coated with a little juice which almost perfectly plugs up that hole so no air can escape. With a top fill hole screw; If the feed holes are open, juice will force itself into the atty and flood it. Again this is due to the tank wanting to have equalized pressure.
This is the good thing about the Rapid Tank. Its fill hole is at the bottom. So turning it upside down, the feed holes can be open. When you inject juice, air will go into the feed holes (equalizing pressure), but nothing will happen otherwise. When you plug the hole and get ready to vape, it'll be fine as you again have equal pressure in the tank.
I'm not a physicist, but an electrical engineer, which required way too many physics classes for my liking.
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