I think the reason why the paper snake turns is .

The hot air rises, and the air currents "blow" the snake around.

The upper part of the flame is caused by the flame, and there is a movement of air. Makes the paper snake turn. The air above the flame is heated up, and the cold air around it is replenished.

Principle

The candle burning we see is not the burning of the paraffin solid, but the ignition device ignites the cotton wick, and the heat released melts the paraffin solid, and then vaporizes to generate paraffin vapor, which is combustible.

When the candle is lit, the flame that initially burns is smaller and gradually larger, and the flame is divided into three layers (outer flame, inner flame, and flame center). The flame core is mainly candle vapor, and the temperature is the lowest; The internal flame paraffin burns inadequately.

The temperature is higher than that of the flame center and contains carbon particles; The outer flame is in full contact with the air, the flame is the brightest, the combustion is sufficient, and the temperature is the highest. Therefore, when a matchstick is quickly placed flat into the flame and taken out after about 1 second, the part of the matchstick that touches the outer flame turns black first.

At the moment when the candle is blown out, a wisp of white smoke can be seen, and the white smoke can be lit with a burning match, which can rekindle the candle, so it can be proved that the white smoke is a solid tiny particle produced by paraffin vapor when it meets condensation.

When a candle burns, the products of combustion are carbon dioxide and water. Chemical expression: C25H52+O2 (ignition) CO2+H2O. The combustion phenomenon in the oxygen cylinder is that the flame is bright and emits white light, emitting heat, and there is a mist of water on the wall of the cylinder.

Simple proof experiment:

Light the candle, cover a cold and dry beaker above the candle for 5 minutes, and then quickly invert the beaker, and find that the inner wall of the beaker is blurred and water droplets are formed, indicating that the candle burns to produce water.

A small amount of clarified lime water was added to the beaker and shaken, and it was observed that the clarified lime water became turbid, indicating that the candle burned to produce carbon dioxide.

The above content reference: Encyclopedia - Candles

The spiral shape of the paper snake is related, like a windmill played by an hour.

Lighting a candle below creates a convection flow in the air, creating an upward movement of air that blows the paper snake.

is counterclockwise, which is the effect of the deflection force of the Earth's rotation. Deflection to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. In the northern and southern hemispheres of the Earth, the direction is opposite.

This is the 355th experiment that the lab has pushed for kids.

The spiral pattern above, have you ever looked dizzy?

Anyway, the explosion is already dizzy.

Today's explosion did the experiment.

It's about spirals.

And make it spin like crazy!

Prepare the materials together.

Let's start today's experiment!

Spin paper snake -

Material. Markers, refills, candles, toothpicks, scissors, confetti, igniters.

Steps. -Step 1-

Use a marker pen to draw a spiral pattern on the colored paper.

Step 2 - use scissors to cut out a "paper snake" along the spiral pattern

Step 3 - Insert the toothpick into the candle and the refill on the toothpick.

Step 4 - Hang the cut "paper snake" on the refill.

Step 5 - Light the candle and the spiral "paper snake" will whirring and spinning!

PrincipleThe candle was lit, and the spiral whirred up, as if dancing lightly.

The principle used in this experiment is mainly as follows: after the candle is lit, the temperature of the flame increases the temperature of the air above, at this time, the air volume expands, the weight is reduced, and the hot air flow rises, and the surrounding cold air quickly fills, so a circulation is formed, and when the circulating air flow through the spiral, it drives the spiral to rotate!

2 plastic bottles teach children how wind is formed.

1 balloon with the baby to play a small rocket that can fly 5 meters in 1 second.

Invade the Minion Banana Lab and take the kids to discover the secret of the bottle's automatic banana peeling.

A balloon teaches you how to build a cool jet racing car.

Click "Read more" to enter the Material Store.

In terms of technical organization management, it is necessary to pay attention to the following two issues, namely, technical department management and organizational management. Because the science and education management work of colleges and universities is complicated and the workload is large, there are certain difficulties in the operation of technical management and organizational management, so it is necessary to strictly strengthen technical management and organizational management. In terms of technology management, a technology management department can be established.

At present, because the original science and education management system of most colleges and universities cannot be expanded or upgraded and needs to be replaced, or the expanded and upgraded management system can not meet the actual work needs and cannot play its real utility and advantages, which not only leads to the waste of manpower, material resources and financial resources, but also adversely affects the efficiency and quality of teaching management. Therefore, if colleges and universities can set up their own information technology team, and introduce advanced equipment and technology, and at the same time develop the corresponding management system according to their own management requirements, or upgrade the system function according to the demand, and continuously improve their own technical management level, it can greatly reduce the consumption of various resources caused by the continuous replacement of the system, and improve the level of their own teaching management. In terms of organization and management, it is necessary to be very clear about the work responsibilities of various departments in terms of data processing, and at the same time, it should also establish a link that can realize the flow of data"Flattening"The management method can effectively avoid the phenomenon of resource sharing blockage and slow information transmission caused by repeated settings or too many layers of departments.

This is because when the fire burns, it evaporates some of the water in the air, and the steam floats upwards.

Kong Ming lantern.

The combustion of fuel increases the temperature of the surrounding air, decreases its density and rises, thus expelling the air in the Kong Ming lantern, making its own gravity smaller, and the buoyancy of the air on it holds it up. Your paper snake is like removing some paper from a Kong Ming lantern and exhausting air from the cracks in the paper. There is air flow.

The paper snake turned.

Combustion expands the air and makes the paper snake swing.