||We need 4 pieces of 3 inch celery, 20 tbsp of salt, 4 clear glasses, and 4 cups of water. We will put 1 cup of water in each glass, add 1 cup of water, add 4 tbsp of salt to two cups, and add 6 tbsp of salt to the other cups. Then put them in the fridge. Remove one of the 4 tbsp cups and one 6 tbsp cups after 24 hours, then remove the other cups after 43 hours. The control variables are the glass, the water, and the celery. The independent variable is the time it sits, and the amount of salt. The dependent variable is the flexibility of the celery.