Simple Cardboard Fan That Really Works! | DIY Fan Without Electricity

This video demonstrates a simple cardboard fan that works without electricity, illustrating the principle of heat transfer through convection. When air is heated, it becomes less dense and rises, creating a natural airflow that can be harnessed to cool objects. The cardboard fan, when placed near a heat source, captures this rising warm air and converts it into a cooling breeze, showing how thermal energy can be transformed into mechanical motion through basic physics principles.