Why can the bubble machine continuously blow out a lot of bubbles?
Jun 02, 2022
Although water can also blow bubbles, the surface tension of water will soon break these bubbles, making them unable to exist for a long time. In order to blow bubbles, you need to add some soap to the water. Soap dissolved in water can reduce the surface tension of water, so it can blow bubbles.
Cause of bubble formation: bubbles are formed due to the surface tension of water. This tension is the mutual traction force that exists inside the object and is perpendicular to the contact surface of two adjacent parts when the object is under tension. The mutual attraction between water molecules on the water surface is stronger than that between water molecules and air. These water molecules are like being stuck to a beggar. However, if water molecules are excessively bonded together, bubbles are not easy to form. Soap "breaks" the surface tension of water. It reduces the surface tension to only 1/3 of that under normal conditions, which is the best tension required to blow bubbles.
Methods to slow down the disappearance of bubbles: the evaporation of water is very fast. When water evaporates, the bubbles disappear as soon as the bubble surface is broken. Therefore, some substances must be added to the bubble solution to prevent the evaporation of water. This kind of water collecting substance is called hygroscopic substance. Glycerol is a hygroscopic liquid, which forms a weak chemical bond with water, thus slowing down the evaporation rate of water.
Bubbles are formed by the surface tension of water. This tension is the mutual traction force that exists inside the object and is perpendicular to the contact surface of two adjacent parts when the object is under tension. The mutual attraction between water molecules on the water surface is stronger than that between water molecules and air. These water molecules seem to be stuck together. However, if water is excessively bonded between, bubbles are not easy to form. Soap "breaks" the surface tension of water. It reduces the surface tension to only 1 / 3 of that under normal conditions, which is the best tension required for blowing bubbles.