Science Project rueangkrot from this experiment aims to test-find out how acids and corrosion. The trial is divided into 2 steps: step 1 is the value of acid level study by applying lemon juice mixed with pineapple juice lime juice mixed with vinegar and pineapple juice mixed with vinegar, to test the acid level up as if to find fruit juice mixed with the acid, which is sorted in ascending order, and in episode 2 to learn about the capabilities in the corrosion of mixed juice in part 1 by salt water leaching into the juice mix all 3, then take the coin with a stain on the entire and/or observation juices 3 trial results.