Bekking soda react with Uncle saichu Orange resulted in carbon dioxide gas, which is less than the density of air, making it a floating gas higher. When carbon dioxide is worse, it will swell up.
Baking soda and vinegar react with carbon dioxide, which causes gas is less dense than air, so the gas rise. When there is more carbon dioxide, it makes the balloon inflates.
Sodium bicarbonate react with vinegar which causes carbon dioxide gas is less dense than the air and gas floating up. When carbon dioxide so much, it will make the inflates balloons out.