Generally speaking, the density of cat litter is between 0.5 and 1.6 grams/cubic centimeter. Assuming a common density of 0.5 grams/cubic centimeter, the weight of 8 liters of cat litter can be calculated as follows:

8 liters of cat litter Sand is equal to 8000 cubic centimeters (because 1 liter = 1000 cubic centimeters). According to the density of 0.5 g/cubic centimeter, the weight of 8 liters of cat litter is 8000 cubic centimeters times 0.5 g/cubic centimeter, which is equal to 4000 grams, or 4 kilograms.