In the field of lithium-ion battery research, "penetration.mp4" files often document . These tests are designed to simulate an internal short circuit caused by mechanical damage.

: Scientists record MP4 videos to show how liquid droplets move through specialized membranes. For instance, a video might show a droplet spontaneously passing from a superhydrophobic (water-repelling) side to a hydrophilic (water-attracting) side.

: A battery cell is charged to 100% and then pierced by a high-temperature resistant stainless steel nail.

: Security researchers often include a screen recording (MP4) in their reports to prove that they successfully bypassed a security barrier or "penetrated" a network. Summary of Usage Common Content of MP4 Energy Storage Battery nail penetration/combustion Safety certification and material testing. Material Science Liquid droplet membrane permeation Analyzing surface tension and permeability. Cybersecurity Exploiting software vulnerabilities Educational training and vulnerability reporting.