Pupils in the experiment of dragon water absorption principle

The principle of dragon water absorption experiment for primary school students is as follows:

Because candles need air to burn. Put the cup on the candle. The cup in the cup has two different spaces. When the air in the cup runs out, the candle will go out. At this time, the air pressure inside the cup is lower than the air pressure outside the cup, and the external air pressure will force water into the cup, thus forming the phenomenon of dragon absorbing water.

Preparation materials: a plate, a candle, a cup and a glass of water.

Production process: first fix the candle on the plate, and then pour some water. Light the candle and put the cup on it.

Result: The candle in the cup went out, and the water outside the cup was sucked into the cup.

Dragon water absorption phenomenon:

Tornado is a kind of tubular rotating airflow, which occurs on land and water, and is called waterspout, which is also commonly known as "dragon absorbs water".

The upper end of "Dragon Suction" is connected with thunderstorm clouds, and the lower end extends directly to the water surface, and the air rotates rapidly around the axis of the tornado. Attracted by the extremely low air pressure in the center of the tornado, the water flow is sucked into the bottom of the vortex, and then becomes a vortex around the axis, moving while rotating. Although the destructive power is not as good as a tornado, it can still have a serious impact on nearby ships and needs to be avoided in advance.

The pressure produced by the atmosphere on the object immersed in it is called atmospheric pressure, also known as atmospheric pressure or atmospheric pressure. On the ground, atmospheric pressure bears the weight of atmospheric column per square centimeter 1.033kg, which is equal to the mercury column with the same bottom area of 760mm high. This pressure value is set as the standard pressure.