Second, you want to consider the material. Plastic funnels are lightweight and affordable, but may not be as durable as metal funnels. Metal funnels are more durable but can be heavier and more ...

Using sandpaper, sand the cut edge of the plastic bottle. It is done to smooth the edges and remove sharp edges to prevent ...

Connect the reversed vacuum to a power source or connect the hose and the glass funnel to an air supply. For a large class, this demo can be done with the plastic funnel and vacuum. For a small class, ...