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氢气流吹肥皂泡的实验,初中化学课本所用装置如图1,发泡的顶端为锥形,不利于肥皂泡的形成,用氢气流不易吹成肥皂泡。我们把锥形顶端改为漏斗形如图2所示,效果显著提高。这是因为漏斗形口端蘸了肥皂液后,在口端已经形成了泡状肥皂膜,同时漏斗形口较锥形口更易聚集肥皂液,从而使氢气流吹出的肥皂泡大,成泡率高。漏斗形玻璃管的制作:在酒精喷灯上将玻璃管口端加热软化,同时将烧红的8号铁丝插
Hydrogen gas flows through the soap bubble experiment. The device used in the junior high school chemistry textbook is shown in Fig. 1. The top of the foam is tapered, which is not conducive to the formation of soap bubbles. It is not easy to blow into soap bubbles with hydrogen flow. We changed the cone tip to a funnel shape as shown in Figure 2, and the effect was significantly improved. This is because after the funnel-shaped mouth end has been laundered with soap liquid, a bubble-like soap film has formed at the mouth end. At the same time, the funnel-shaped mouth is more likely to collect the soap liquid than the conical mouth, so that the soap bubble that is blown out by the hydrogen flow is large and the bubble formation rate is high. high. Production of funnel-shaped glass tube: Heat and soften the end of the glass tube on the alcohol torch, and insert the red 8th iron wire