When is a Scuba Cylinder Full?

… or, “why does my cylinder pressure change so much?”

Let’s face it, we’ve all been there. We go to a shop, we get our cylinders filled, we check the Pressure, we’re happy that they’re full, we go diving, and as soon as we hit the water, we notice that there’s less Pressure in our cylinder. Why is this, and where did that Pressure go?

Continue reading “When is a Scuba Cylinder Full?”