With these measurment,we can say that the Ph in the outside artificial puddle grow faster than the
ph in the inside artificial puddle.
The other measurement show that the temperature is also higher outside than inside.
-a higher temperature make micro-organism more active,an accelerate the decomposition of the lettuce.Thus,the Ph grow faster with the higher temperature.
-a higher temperature also make evaporation faster. The amount of water reduce,but the amount of acid stay the same,so the acid concentration grow up,and so the ph.