Final answer:
The strength of the smell in the balloons would likely not be the same after 2 minutes and 2 hours due to diffusion and permeation, where scent particles escape from the balloon, similar to helium deflating over time due to effusion.
Step-by-step explanation:
If you smelled the balloons 2 minutes after the extract was added, and again 2 hours after the extract was added, the strength of the smell would likely not be the same. Over time, the scent particles can diffuse through the balloon's material, reducing the concentration of the scent inside the balloon. This process is akin to effusion, where gases can escape through small pores in materials. Furthermore, the scent concentration can decrease as a result of a process called permeation, where the scent molecules penetrate and pass through the balloon's material.
Factors like the material of the balloon and the nature of the scent extract can influence the rate at which the scent diminishes. For example, a balloon made of a porous material would likely allow the scent to fade faster than a balloon made of a more impermeable material. Additionally, volatile compounds present in the extract may evaporate and diffuse away more quickly.