Okay so I was poking around the wiki for the video game Fallout 3 the other day when I came across this page: http://fallout.wikia.com/wiki/T-51b_Power_Armor [Broken] It has specs on the armor (keep in mind this is mostly the type of stuff the game designers make up for interesting backstory, so it is all theoretical and highly unrealistic) which include various things about its power supply, protection, manufacture, etc. One part in particular interested me: the fact that it can absorb 2500 joules of kinetic energy. Now, to the average person, such as myself, a joule doesn't mean much. I looked it up but didn't find out much more than I already knew, though the specifics were somewhat new. So, my question, in short is... what's the easiest way to describe this in common terms? I was thinking of trying to convert it into something along the lines of pounds of pressure per square inch during a split second collision (say with a bullet, for example). However, I wasn't able to find anything near that - so I'm feeling that my conversion and lack of physics knowledge might be getting in the way. Any ideas? All I'm really interested in getting is a more simple (yet still based on hard numbers and science) explanation of the type of protection this theoretical suit of armor would provide.