Recently bought some helium balloons to celebrate a birthday.
I have noticed that the ‘0’ does not form a complete loop. But it’s filled from the bottom, not the “end” of where the loop has been closed.
On further research it appears the numbers where there are loops are always closed off, when surely it would be less work to just punch a complete circle together and not have two closed ends (source of leaks?). A google showed me lots of different brand balloons seem to be made this way but I could not find an answer of why they are made like this. Complex shapes such as a ‘4’ are made, so why not simplify the ‘0’ and make it a complete circle?
I assume there is a manufacturing or scientific reason on why this is the case. But why?