percent difference

the percent difference in the 100 ml of water to what it took to make it slide averaged out to about 220% difference. To find the percent difference you do 320 (what it took to make it slide) - 100 (starting amount of water) divided by 100 the starting water content then times 100 and you get 220%. (this is for potting soil. For sand it took around 150 ml of water. so potting soil is more prone to slideing.