The video is a tutorial on creating a ball from recycled plastic. The presenter starts by purchasing a kilogram of plastic from a recycling cooperative. The plastic, specifically high-density polyethylene (HDPE), is chopped into tiny pieces and melted in a baking tray. The melted plastic is then poured into a mold made from a lathe and allowed to cool. The presenter notes that the plastic's density and the mold's shape affect the final product's size. After the plastic cools and is removed from the mold, it is cut and shaped into a ball. The presenter also mentions that the process of melting and shaping the plastic requires careful temperature control to prevent the plastic from burning. The final product is a ball made from recycled plastic, which the presenter describes as a practical and eco-friendly alternative to traditional plastic balls.
1. The video content begins with a demonstration of creating a ball out of recycled plastic. The plastic used is high-density ethylene (HDPE), sometimes referred to as PH or Siri in Portuguese.
2. The host of the video purchases two and a half kilograms of plastic from a recycling cooperative. The plastic is bought at a low cost of R$ 8.
3. The plastic is then chopped into tiny pieces and the volume of the sphere is calculated using the formula for the volume of a sphere.
4. The video references a book of mathematics, which includes a formula for the volume of a sphere.
5. The host calculates the amount of plastic needed to make the ball, taking into account the price and density of the plastic.
6. The plastic is then melted using an oven, with the host noting that temperature control is manual and it is necessary to leave the door half open to control the temperature.
7. The melted plastic is then pressed into a fabric to create a ball, with the host noting that the ball will be hexagonal.
8. The ball is then cooled in water, and the host notes that it is less dense than the water.
9. The host then demonstrates how to polish the ball to remove any cracks.
10. The final product is a ball made out of recycled plastic, with the host noting that it's crazy to think that it came from a bottle.