There would be no detectable difference.
A tubeless tire can get punctured but air will leak slowly.
Yes, even if it is punctured - in the event of a puncture, there'll still be air in the tire, it just won't be pressurized.
No, heavier by the weight of the extra air put inside it. Even if you filled the tire with helium it is still heavier, although the additional weight would be less than the additional weight of air.
A full tire is heavier than a flat tire. When a they are both flat they weigh the same but added air makes the full tire heavier.
Your tire is losing air because one or all of the following, - A foreign object punctured your tire - Your valve stem is leaking - There is corrosion in between the bead of your tire and the rim - Your rim is cracked ( very uncommon but possible )
I believe you mean Run-flat they are tires that are designed to maintain the air pressure if the tire gets punctured but they only last for a certain amount of distance(depending on tire model)before they deflate
Tubeless tires still loose air when punctured, just at a slower rate.
A zeppelin was a lighter-than-air craft like a blimp or balloon, yet it had a rigid airframe like a heavier-than-air craft. If you punctured a hole in a nonrigid blimp or balloon, or a semi rigid dirigible, it would deflate and lose its shape, whereas the rigid airframe of a zeppelin would hold its shape.
Depends on how you look at it. Tire + lots of pressurized air inside will weigh a tad more than tire with only a little air inside. But the actual tire casing will weigh the same whether it's inflated or not.
Because air, fluffy as it is, is still "stuff", and all stuff has weight. When you pump a tire you're putting more stuff into it, so the weight do go up.
it will run out of air
air with an air pump