R. . Parashar and R. K. . Parashar, “The Simple Classroom Method to Demonstrate the Law of Conservation of Mass”, SS, vol. 56, no. 4, pp. p.26–28, Dec. 2018, Accessed: Aug. 18, 2025. [Online]. Available: http://ejournals.ncert.gov.in/index.php/SS/article/view/2646