Product Principle:

By steadily rotating the generator crank, light is shone on a small windmill in a vacuum, causing it to spin. White objects absorb light less while black objects absorb light more, resulting in a difference in light energy between the black and white blades. This energy difference is converted to mechanical energy, driving the small windmill blades to rotate. The greater the difference in light intensity, the faster the rotational speed.

Gameplay Points:

Steadily rotate the generator crank and observe the light-pressure windmill (radiometer), where the blades alternate between black and white. Though there is no wind, the small windmill in the vacuum spins rapidly under the illumination of light. Stopping the generator crank also stops the windmill’s rotation. Sunlight provides not only light and heat, but also weight and pressure. The light pressure on 5 square meters of ground is equivalent to the weight of one grain of millet. The pressure on the blades is equivalent to 0.00006 grain of millet.