Air environment

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This exhibit mainly displays a transparent Yagli water column in appearance. In a relatively calm state of pure water inside the water column, gently grasp the red iron rod with both hands and quickly press it down. After trying several times, in an ideal state, an air ring will appear in the middle of the water column that rises uniformly and gradually increases in inner diameter.

It mainly demonstrates the Bernoulli principle to us. Bernoulli's principle, in simple terms, means low pressure, fast flow rate, high pressure, and slow flow rate. When we press the handle, air bubbles quickly pass through the circular hole at the bottom of the cylinder, disturbing the originally stationary water and forming a vortex. According to Bernoulli's principle, when the pressure of a flowing fluid decreases, the surrounding static water with high pressure will be replenished, and a continuous effect will form a vortex. This annular vortex is distributed around the circular hole and moves upwards with the direction of gas movement. The air ring we see is actually the movement of water under the principle of wave force.

Further careful observation of the air ring reveals that the direction of the vortex is from the inner edge of the bubble upwards, to the outer edge and then downwards, as if the air bubble has been punctured from the bottom. This circular vortex binds the air particles inside, thus forming the air ring we see. If the water inside the container is not stable, no matter how hard we try, we cannot create a circular air ring. The air particles will rise at a constant speed, and we will see some dispersed small bubbles rising rapidly and gradually becoming larger.