Hello, first post here. You're missing a hypochondria section, so this one will have to do it, I apologize. I apologize also for this question may seem to better belong to Yahoo answers than here.

As in the headline, how much external pressure is required to deform the skull of an adult man?
This kind of information should be widely known - I guess all kinds of tests on helmets and safety equipment need to quantify the interested forces - but I couldn't come across it after extensive searches.

I am wondering about the steady pressure such as the one coming from compressing the skull with one's hands.

Thank you for any insight.