The minimum hydraulic pressure needed to break the skin and cause injury is: EMT The minimum hydraulic pressure needed to break the skin and cause injury is: A) d. 2000 psi B) b. 500 psi C) a. 100 psi D) c. 1000 psi Answer: C) a. 100 psi Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+