1. Clean the eraser with a brush. Materials: large eraser, paintbrush.
Tools: scissors, glue.
Production method:
1. Dig a small, shallow round hole in one end of the eraser 2. Remove the tip of the trash brush, wash it and dry it.
3. Cut the end of the brush tip to turn it into a small brush
4. Insert the tip of the brush into the small round hole of the eraser and stick it firmly with glue (finished)
2. Small production: solar hot water bottle
Material:
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Large black plastic bag, rope.
Preparation method:
Fill the black plastic bag with water, tie the opening of the bag tightly and expose it to the sun (see photo). After a while, the water in the bag will be warm and can be used to wash your face and feet.
3. Materials: nuts, matches, plasticine, small strips of fabric.
Steps:
1. Put the tip of the nut on the fire and burn it for a while, then throw it into cold water. The nut will crack along the seams.
2. Break the walnut into two halves along the seam.
Antique clock - hourglass
1. Take out the two boxes of jelly that were eaten and poke a hole in the middle of the boxes of jelly.
2. Take out another clear straw and use the straw to connect the two jelly boxes together.
3. Put the sand into the jelly box, then close the opening of the jelly box with plastic wrap. (Complete)
3. Remove the walnut kernels, leaving the shell empty, and stick a small piece of modeling clay inside the shell.
4. Use matches and a small piece of fabric with “Dream” written on it to make a sail and insert it into the playdough. In this way, a “walnut ship” carrying dreams can set sail.
Hot water bottlesolar
1. Use thermal radiation to transfer solar energy to the hot water bottle.
2. In order to improve the ability to absorb sunlight, hot water bottles are usually made from black materials.
3. When using hot water indoors, you can use the relationship between flow and pressure to adjust the hot and cold degree of the water.
In Yunnan, Guangxi, Hainan, Vietnam, Cambodia and other places, insulated solar hot water bottles are needed in winter. In winter, the temperature is 8 to 10 degrees Celsius, with 4 to 5 hours of sunshine. You can use it to take a bath and wash clothes at night. The super insulated solar hot water bottle produced by Yueyang Taibang can maintain the temperature until 11 p.m.-1 p.m.
Ordinary solar hot water bottles are not effective in winter and do not maintain heat.
Ordinary solar hot water bottles includingThe factory price is a few yuan generally have a lifespan of 1-2 years or less, while red mud bags cost at least 3-5 years. much more expensive.