A bubble was saved for 3 years! How exactly does James Dewar do it?

When the liquid film of the soap bubble is disturbed and thinned, the surface tension in this part of the area will increase and exert a greater pull force on the surrounding liquid. As a result, the liquid is naturally pulled to a thinner place and then has the ability to heal itself completely, a phenomenon known as the Maragoni effect.

During Christmas 1889, he gave several public lectures to show young people the soap bubble experiment. One of the experiments was like this, a ring was put into soapy water and flipped over to form a soapy film, if one line was tied to the ring, one of which was a double line, three films would be formed, and the film in the two lines would be pierced, and the area wrapped by the two lines would naturally form a circle.

James Dewar, a pioneer in cryogenic natural gas research, famously invented the dewar to preserve liquid air. For the last 20 years of his life, he immersed himself in the study of the surface tension of soap bubbles. He set an amazing record.

By carefully preserving the bubbles in special bottles to reduce contact with airborne impurities, James Dewar kept the bubbles for three years.

Presumably, the bubbles in the bottle also felt the power of the Maragoni effect. The soap film itself is colorless, and sunlight reflects and interferes with the upper and lower surfaces of the soap film, respectively. Sunlight is composed of visible light of different wavelengths.

In one part of the film, the red light in the two reflected light cancels each other out, and this part is blue-green, and in the other part, the red light may be intensified.

In addition, the thickness of the soap film is uneven, and the thickness of the film is also changing all the time due to the interference of airflow and gravity. As a result, the entire soap bubble takes on an ever-changing color, a phenomenon that occurs on the surface of an oil film, a lens or a pearl floating on the water.

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Through a lot of hard work, he studied the ratio of bubble water, one kilogram of water with 50 ml of dawn professional detergent, 2 3 grams of guar powder, 50 ml of external alcohol and two grams of baking powder. So blow up the super bubbles.

The main reason is that he kept the bubble in a special bottle, which reduced the contact between the bubble and the air, and avoided some natural factors to damage the surface of the bubble.

Because the bubbles feel the power of the Maragoni effect. When the liquid film of the soap bubble is disturbed and becomes more numerous, the surface tension in this part of the area will become greater and exert a greater pulling force on the surrounding liquid. As a result, the liquid is naturally pulled to a thinner place and then has the ability to heal itself completely.