A mix of cold and hot air on the left balloon creates lift, the balloon on the right where air is heated inside however, does not have lift. The balloon on the right is inflated but does not generate lift.
Still hot air.
Note: Yes, a floating body displaces its own weight and a submerged body experiences lift due to the pressure difference on the top and bottom effective areas. The question here is: why hot air has lift and rises? More importantly, how hot air acquire lift and rises? The shape of the inflated balloon is the result of hot air rising, not the cause of hot air rising and not the ultimate cause of the balloon rising.
