Surely not? The point of pressure is that it's constant per area, so no matter how much is covered, the pressure felt is still 5 psi.
No. Put 5psi on a 1 inch x 1 inch area of my hand and I will be okay.
Put 5psi on a 12 inch x 24 inch area of my torso, and I will be very much not okay.
this is correct
For arguments' sake, the whole human.
This kills the human (joking... I don't really know)
Let's say an human with height 170cm and hip width of 85cm (these are between the averages men & women) gives a rectangular area of about 1.4 m^2; the head and legs aren't as wide as the hips, but this doesn't include the arms, so let's take it as a guess of the weight-bearing area for a prone or supine human. This area times 5 psi is more than 5,000 kg (more than 11,000 lbs). So yes, I think it would kill someone.