Originally Posted by
Rootman
How would you balance the air volume? Wouldn't the first tube inflated take most of the room and the other 1 or 2 just take less and less air?
Read the 2nd paragraph of the post just above.
Applying
Boyle's Law, a full tire at 1/3rd the pressure is the same amount of air as 1/3rd the volume at full pressure. So following the sequence I outlined, each tube would occupy 1/3rd the space within the tire. If you fill the first tube to full pressure, you couldn't add any air to the others without increasing the pressure in the first.
Regardless of whether one would ever bother with a three tube tire, it's an interesting exercise in physics. It's the same logic one would apply if filling a chamber with mixed gasses, say as blending breathing gas used for deep diving.