Delta-P?

Delta-P, in it’s most simple form, is how to write a change in pressure. The delta (or triangle) signifying change and p signifying pressure. Delta-P is used primarily by divers to calculate the difference in pressure between two bodies of water.

Delta p.jpg

Image Above

In the Diagram above, there are two tanks of water filled at different levels, with a small pipe connecting the two. You would use Delta-P to figure out the difference in pressure between the two tanks.

Source - ADCI