Hand inside vacuum chamber experiment - GIF

[Frank S]

His name is James Orgill and he has a PhD in chemical engineering. His voice is annoying as hell, but he's super smart and his Youtube channel is top shelf.

https://www.youtube.com/c/TheActionLab/featured

Many of the older generation people would have learned about the hazards of having your body subjected to both negative and positive pressures during science classes in school, through the demonstrations of placing objects such as grapes apples bananas or small cuts of meat in clear chambers then have the air pumped out or the pressure increased, while the teacher explained what was happening to the objects as they were going through the transformations.
I remember seeing such demonstrations in my earlier years in schools maybe in grade 5,6 or 7 and for sure in science and chemistry lab in high school. However, I was in school back during the Mercury, Gemini and Appolo era.
I highly suspect the practice of classroom demonstrations such as these may have fallen out of the educational curriculum for later generations.