What kind of scientific inventions are there? I ll hand it over tomorrow! Help me!!

Homemade thermometer.

Equipment: 1 litre and 1 2L PET bottle, scissors, red ink, clay, straw, scissors, ruler, thermometer, oil-based pen.

Steps: 1Fill a 1L PET bottle with cold water.

2.A few drops of red ink are added to the water to stain the water red for easy observation.

3.Use the pen to roll the clay rod into a long strip and roll it on the straw in the shape shown below. The shape of the rolled clay is slightly modified so that it can be used as a stopper and fits perfectly into the mouth of a 1-litre PET bottle.

4.Put the clay stopper made in step 3, stuff it into the mouth of the bottle, check whether there is a hole in the clay stopper, whether the straw is compressed and deformed, and adjust the water level height so that the water level is slightly higher than the bottle mouth, and mark the water level of the straw with an oily pen, and the homemade thermometer is done. Make a note of the room temperature at this time.

5.Use scissors to cut off the top end of the 2-liter PET bottle to form a container, and place a homemade thermometer into this container, as shown in the picture on the left.

6.Put hot water in a container (be careful!) Don't burn! After standing for 10 minutes, measure how much the water level rises with a ruler? At the same time, the temperature of the hot water is measured with a thermometer, which is shown in the table below. (1 litre of water rises from room temperature to 80 by about 12 ml, if the straw is too thin, do not put it in too hot water, otherwise the water will overflow the straw after expansion.)

7.Pour out the hot water in the container, put ice water instead, let it stand for 10 minutes, and then measure it with a ruler to see how much the water level drops? At the same time, the temperature of the ice water is measured with a thermometer, which is noted below.

Room temperature hot water ice water.

Temperature compared to the original water level (indicating an increase or decrease).

Make an ashtray out of a cardboard box!

Look at the connection!

Eco-friendly double-walled plastic bags.

Realization method: the realization of environmental protection double-layer plastic bag is very simple, as long as in a plane, an ordinary plastic bag is made into two layers, or two plastic bags are combined into one, and the environmental protection plastic bag can be obtained.

Significance of invention: When people eat, especially when traveling, when eating things with peels, they always litter waste peels, with double-layer environmentally friendly plastic bags, you can store the peels separately in a bag, so that you will not litter things anymore. Protects the environment.

Find a small plastic bottle with eye drops and an iron nail, wrap them together with adhesive tape, poke a few small holes in the side wall of the plastic bottle next to the iron nail, and attach a rubber tube to the mouth of the bottle, and this is a model of a submarine.

Categories: Education, Science, >> Science & Technology.

Analysis: Siemens --- generators.

Benz --- the car (internal combustion engine trend).

Bel---**.

Marconi --- wireless telegraphy.

Nobel --- explosives.

Edison --- electric light.

Thomson (1856-1940) was an English physicist. 1897 discovered the structure of matter the first elementary particle one electron.

Fulton (1765-1815) was an American inventor. In 1807, Fulton made a steamboat.

Benz (1844-1929) German engineer. In 1868, the world's first three-wheeled internal combustion engine car was built.

Volta (1745-1829) Italian Ota physicist. In 1800, he made voltaic stacks, and after a long time, he invented voltaic batteries, so that people could obtain a stable and continuous current for the first time.

Otto (1832-1891) was a German engineer. In 1876, the first four-stroke cycle gas internal combustion engine was built. made possible the advent of automobiles and later airplanes.

Daimler (1834-1900) was a German mechanical engineer. The first gasoline engine was built in 1883, and in 1886, the world's first four-wheeled internal combustion engine car was made.

Parsons (1854-1931) was a British inventor. In 1884, the first multi-stage reactionary steam turbine was built.

Diesel (1858-1913) German engineer. Brother Hunger Potato built the first diesel engine in 1897.

Bessemer (1813-1898) was an English engineer. In 1856, the converter steelmaking method was invented.

Thomas Edison (1847-1931) was an American inventor. He completed more than 1,300 inventions in his lifetime and had a huge impact on mankind. In 1897, he succeeded in developing the incandescent lamp.

Morse (1791-1872) was an American inventor. In 1837, the telegraph was invented, and on May 24, 1844, the world's first telegram was sent.

Bell (1847-1922) was an American inventor and envy. Invention in 1876**.

Marconi (1874-1937) was an Italian engineer. In 1895, wireless telegraphy was invented. On March 28, 1899, he succeeded in radio communication.

Nobel (1833-1896) Swedish inventor. In 1867, safety explosives were invented.

I made a model of a small electronic balance, and note that this is a model that can only weigh very light objects, such as two small scraps of paper. The materials needed for the production are: a wooden board (preferably a little thinner, not too large), a washer, a paper clip, an awl, an electric soldering iron, several wires, two light-emitting diodes, a battery.

These materials are easy to find, and if you don't have LEDs, you can go to the electronics market and buy them, which are very cheap.

The production process is as follows: turn a small hole with an awl in the middle of the board, bend a paper clip into a hook shape, and fix it perpendicular to the board through the small hole, and hook it to hang the washer. Then take two paper clips and straighten them in half, leaving only one turn, which is actually the arm of the balance and the rest of the curved part is the tray.

Another paper clip does the same. Then the two paper clips and washers are welded together, the washers are in the middle, and the paper clips are in a straight line. Then hang the washer on the hook and adjust the distance between the hook and the board, about 3mm.

Then fix two paper clips under two trays, and next to the paper clips are ready to use LEDs as indicator lights. With a circuit underneath the wooden board, the balance is equivalent to a SPDT switch. This circuit is equivalent to two circuits, sharing one power supply and two light-emitting diodes.

As long as the left side sinks, the left tray will communicate with the pin under him, so that the circuit is turned on and the diode emits light; If the weight of both sides is equal, the circuit is not open, and both diodes are not lit.

Make a simple small fan Material: Battery, Racing Motor, and Fan Blade The fan blades can be stacked with paper by yourself.

Riveting two identical protractors at the center of the circle and turning flexibly, the upper protractor is broken along the right end with a gap of l centimeters long, when measuring the angle, let its opening coincide with the two sides of the angle to be measured, and the scale indicated by the gap is the degree of this angle; When drawing the corners, first align the notch with the specified scale, and then draw two rays along the opening. This protractor can also measure the angle of three-dimensional objects such as nuts.

Because this kind of protractor resembles a scissor when used, we call it a "scissor protractor".

It's too demanding, isn't this okay?

Say invention making. A small fan, just a small motor, two size 5 batteries, some short wires, a solid plastic foam, a pair of scissors, some pieces of cardboard! First of all, hollow out the solid foam and connect it with wires.

Homemade coloured candles.

Materials: colored crayons, wax.

Directions:1 Find a discarded canned beverage bucket (e.g. 1 25 litre Coke bottle), neatly cut off the lid, and cut the wax into the bucket.

2 Put the bucket in hot water and stir the wax inside until it melts completely. It is best to use boiling water. However, ask your parents for help or be under the supervision of your parents.

3. Pour the molten liquid into a nicely shaped container (e.g., a heart-shaped box for a small piece of paulownia and a simple and choktonic knai). Don't pour too much. As for the reason, look down. Of course, you first need to put the thread in the container as a wick.

4 The original wax cooled down, and Ah poured the melted colored crayons into it according to the method of dividing the face (colored crayons came in handy at this time). In this way, the wax of different colors is added layer by layer, and the beautiful candle is made.