1. 7 1 12 years old manual science small production name: automatic water feeder
Material preparation: a coke bottle of 1000 ml, a mineral water bottle and a plastic pipe with a diameter of 0.5 cm and a length of 40 cm.
Manufacturing steps: (1) Drill two holes with a diameter of 0.5 cm on the bottle cap of mineral water.
(2) Divide a 40cm-long plastic pipe into a 30cm-long positioning water pipe and a10cm-long water supply pipe, and insert them into the bottom of the bottle and the other into the bottle mouth.
(3) Take10cm from the bottom of the coke bottle, cut it into a basin, and drill a hole with a diameter of 0.5cm above and below the basin.
(4) Insert the water supply pipe into the lower hole, and insert the positioning water pipe into the lower hole.
(5) Connect the water supply bottle and water basin with iron wire.
How to use:
1. Unscrew the water supply bottle cap, fill it with water, tighten it, and then pour a proper amount of water into the water receiving basin.
2. When the water in the receiving basin is lower than the water level, the water in the water supply bottle will flow out. When the water in the receiving basin is higher than the water level, the water supply bottle will stop supplying water again.
Second, how to prepare for the science experiment for primary school students: glass or jar, water, dropper, shaving cream, food coloring.
Experimental steps: 1. Pour water into the glass, about one inch from the edge.
2. Carefully add a layer of shaving cream to the water to ensure that it is not too thick, otherwise it will take a long time to wait. Shaving cream represents clouds and water is the atmosphere.
3. Add a few drops of blue food pigment to the shaving cream. The weight of food coloring will start to push the shaving cream and then fall into the water in the glass! It looks like rain.
Third, the significance of scientific experiments to children 1, the experiment satisfied children's thirst for knowledge and curiosity. For children, curiosity is nature, and the experiment itself is full of unknowns and surprises. Through experimental operation, they can not only satisfy their curiosity, but also cultivate the spirit of dedicated exploration.
2. Cultivate children's ability to observe and remember. Scientific experiments are very rigorous, and we must not be careless and sloppy. Observation is the first step, and besides observation, we must have a strong memory.
3. Cultivate awareness of rules. The purpose of the experiment is to find the law of reaction and synthesis of things through failure and groping, and then understand their essence. The law of things is objective, and it is not transferred by personal will. Through the experiment, not only the thinking is activated, but also the consciousness is cultivated. Effectively combine theory with practice perfectly.