How do they work?
Why does a balloon expand?
Pressure increases as air is blown into the balloon. This pressure pushes outward on the balloon's skin and holds it taut.
What is buoyancy?
Buoyancy is when the weight of an object is less than the weight of the air (or water) it displaces.
How does a balloon float?
The weight of the balloon and the gas inside it is lighter than air.
Why do balloons lose air?
Latex material is pourous
Gas's atoms are small enough to escape
As gas escapes, pressure decreases and balloon sinks