Final answer:
The expected erosion of Mylar due to atomic oxygen is influenced by factors such as ozone depletion and the density and composition of the material itself.
Step-by-step explanation:
When it comes to the expected erosion of Mylar due to atomic oxygen, it is important to understand the role of ozone depletion in this process. The depletion of the ozone layer, caused by man-made substances like chlorofluorocarbon gases, allows more UV radiation to reach the Earth's surface. This increased UV radiation can lead to the degradation and erosion of materials like Mylar.
Mylar is often used in materials like balloons to retain helium for longer periods of time. However, because Mylar is a thin film with many fewer pores than rubber, it is less susceptible to erosion caused by atomic oxygen. This is why high-quality Mylar balloons can retain their helium for days.
Overall, the expected erosion of Mylar due to atomic oxygen is influenced by factors such as ozone depletion and the density and composition of the material itself.