Small experiment and principle of toothpick science

The scientific experiment and principle of toothpick are as follows:

Carefully place the toothpick on the water; Put the sugar cubes in the basin, away from the toothpicks. The toothpick will move in the direction of the sugar cube; Change a basin of water, carefully put the toothpick on the water, and now put the soap in the basin near the toothpick. Toothpicks will stay away from soap.

Putting the cube in the center of the basin will absorb some water, so there will be a small water flow in the direction of the cube and the toothpick will move with the water flow. However, when you put soap into the basin, the surface tension at the edge of the basin is strong, so you will pull the toothpick out.

Chemical laboratory, generally equipped with safety glasses, protective masks, gloves, laboratory clothes; Some physics laboratories may also be equipped with safety shoes and protective earplugs. Full protective glasses (eyes and face are the most vulnerable parts in the laboratory, so protection is particularly important. In the laboratory, neon experimenters must wear safety glasses.

When chemicals splash into eyes, they should be washed thoroughly with water immediately. When washing, you should open your eyelids, wash it carefully with tap water for a few minutes, then wash it with distilled water, and then go to the infirmary for treatment. Polyethylene disposable gloves: used to treat corrosive solid drugs and dilute acids, such as dilute nitric acid. However, this kind of gloves cannot be used to treat organic solvents, because many solvents can penetrate polyethylene, resulting in holes in the joints.