What does PPM stand for? on the back of the advanced nutrients

[Sjapp]

i bought some advanced nutrients for my plants, and i don't know how much to add to my water.

Sensi Grow (Part A & B)

This website has the table that says how much to mix, but i don't know what ppm stands for.

please help

Sjapp Reviewed by Sjapp on 02-29-2008. What does PPM stand for? on the back of the advanced nutrients i bought some advanced nutrients for my plants, and i don't know how much to add to my water. Sensi Grow (Part A & B) This website has the table that says how much to mix, but i don't know what ppm stands for. please help Rating: 5