Fold the four sides of the paper in half to get the largest volume with the smallest area and generate the largest buoyancy.

Bearing skills of paper boats;

1: The bottom of the paper boat protrudes upward, so that there is air between the bottom and the water, and the paper boat is not easy to sink.

2. The bottom area of the paper boat is larger.

3. Put the coins evenly to make the paper boat bear less pressure per unit area.