The material general family has! Come on, don't go through today's 13.50

The material general family has! Come on, don't go through today's 13.50

Fish tank cleaner! It is made of rope, wooden stick and soft pipe. Make a hole on both sides of the wooden stick, so is the soft pipe! Put on the rope and fix the pipe on the wooden stick. The pipe should be 1-2m, and the wooden stick is 3-5cm thick
It's definitely my own idea! If it's not, heaven strikes thunder!

It's in urgent need of a small invention suitable for the third grade of primary school. It's simple and easy to find materials! @!
We should take concrete steps

innovative invention method of making 1, homemade badminton preparation materials: one empty drink bottle, two sets of foam fruit net, one rubber band, one glass.1., one.1. take 250 ml empty drink bottle, the upper part of the bottle is cut off, 2. cut the part into 8 parts, scissors cut to the bottleneck, and then each cut...

Put a small beaker with water in the big beaker with water, and then heat the water in the big beaker. Through heat transfer, the water in the big beaker has boiled, but the water in the small beaker does not boil. Measure with a thermometer, the temperature of the water in the big and small beakers is the same. No matter how long it is heated, the situation is still the same. Why?
2. Take a glass cup, fill it with water, cover the mouth of the cup with a piece of cardboard, hold the cardboard with your hand, turn the cup upside down, release the hand pressing the cardboard, and then turn the cup to the left, right, front and back. Observe: will the water in the cup stay? Think about why.
3. In summer, if we want to take the ice cream outside to enjoy, but we don't want them to melt too fast, what can we do?

There must be a temperature difference in heat transfer. When the water reaches 100 ℃, there will be no heat transfer, and the boiling water must be heated continuously, so it will not boil. It will be different if the boiling point is higher
No, do you know the atmospheric pressure? That's the strength of atmospheric pressure
3. In a cool environment