Jimmy is working on his science project: an erupting volcano. He decided to use vinegar and baking soda for the eruption reaction. He tested it over and over and was extremely pleased with the results

Jimmy is working on his science project: an erupting volcano. He decided to use vinegar and baking soda for the eruption reaction. He tested it over and over and was extremely pleased with the results. Before the science fair judges came to observe, Jimmy added water to his vinegar supply so that he would not run out of vinegar. Why did Jimmy lose the science fair competition?