Here you go: http://www.naturallycurly.com/texture-typing/hair-...I hope that helps!
Do the float test. The Float Test: Take a couple of strands of hair from your comb or brush and drop them into a bowl of water. Let them sit for 2-4 minutes. If your hair floats, you have low porosity. If it sinks, you have high porosity.
You could do the water test. Put a couple of hair strands in some water. Wait a couple of minutes. If the strands float you have low porosity. If the stands sink then you have high porosity.