Question

Why do helium balloons slowly deflate over time?(1 point)
Responses

The helium inside the balloon condenses into a liquid
The helium inside the balloon condenses into a liquid

The balloon material absorbs the helium molecules.
The balloon material absorbs the helium molecules.

Air molecules outside the balloon force helium back into the balloon.
Air molecules outside the balloon force helium back into the balloon.

Helium molecules diffuse from an area of higher concentration (inside the balloon) to lower concentration (outside air).

Answer 1

Helium molecules diffuse from an area of higher concentration (inside the balloon) to lower concentration (outside air).

Explanation: helium atoms are very small and can pass through the balloon material (or leak at the knot), so they slowly escape by diffusion.