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phymatter
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if air is pushed inside a soap bubble then why does the pressure decrease ?
Bill_K said:The typical thickness of the walls of a soap bubble is about a micrometer, regardless of the diameter of the bubble. I don't really see how the tiny difference in curvature between the inside and the outside would matter.
Soap bubble pressure is the force per unit area that is exerted by a soap bubble onto its surroundings. It is the result of the surface tension of the soap film and the internal pressure of the air trapped inside the bubble.
Soap bubble pressure decreases because as the bubble expands, the surface tension of the soap film decreases, resulting in a decrease in the force per unit area exerted by the bubble. Additionally, as the air inside the bubble cools, the internal pressure decreases, further contributing to the decrease in bubble pressure.
Temperature has a direct effect on soap bubble pressure. As the temperature increases, the air inside the bubble expands, increasing the internal pressure and therefore increasing the bubble pressure. Conversely, as the temperature decreases, the air inside the bubble contracts, decreasing the internal pressure and resulting in a decrease in bubble pressure.
Aside from temperature, other factors that can affect soap bubble pressure include the type of soap used, the size of the bubble, and the presence of impurities in the soap film. Different soaps have different surface tensions, which can impact the bubble pressure. Larger bubbles have a larger surface area, which can result in a lower bubble pressure. Impurities in the soap film can also affect the surface tension and therefore the bubble pressure.
Soap bubble pressure can be measured using a variety of methods, including pressure sensors, manometers, and simple visual observations. The most accurate method is using a pressure sensor, which can measure the force exerted by the bubble on a specific area. A manometer measures the difference in pressure between the inside and outside of the bubble. Visual observations, such as noting the size and shape of the bubble, can also give an indication of the bubble pressure.