A small amount of air or helium within the balloon will escape through the balloon material.
No not at all. The only thing difference is that the lava will make a lot of bubbles.
A weather balloon floats in the atmosphere to gather clue about weather all over the world.
If there's a fan in the room or the air is moving, the balloon will move with it.
If it's a UL compliant lamp, nothing. Except your energy bill goes up a little.
No you do not have to but you can it is completely safe a lava lamp is made to be as a decoration light so you CAN if you want to but you will go through bulbs faster!
Your feet shrink
If you leave it over night it goes squishy, rubbery and very flexible
it becomes shrivel
It creates static electricity.
Depending on how cold the cooler is, the water balloon what shrink from the cold and the water would remain liquid, or it would freeze and probably burst.
the balloon will start to blow up by the heat
Yeast eats the sugar giving off CO2 which is a gas that will inflate the balloon. Added: But since carbon dioxide is heavier than air this balloon gas will never reach the 'top'