Final answer:
The correct amount of pressure for wound irrigation by a nurse is generally between 4 and 15 psi. It effectively cleans the wound without causing additional harm.
Step-by-step explanation:
When irrigating a wound, it's important to apply the correct amount of pressure. The nurse should follow the general guideline of keeping the pressure between 4 and 15 psi. This range is sufficient to clean the wound effectively without causing further damage or pain. It's not done by calculating the wound size, and while it shouldn't be strong enough to cause moderate pain, pressure should also avoid creating a splash off of the wound.