Pressure and Gas Solubility (Henry's Law)
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- Опубликовано: 23 май 2021
- Here we look at pressure and solubility of a gas dissolved in liquid. This is a relationship referred to as Henry's law. In this case, the solute is a gas, and the solvent is a liquid, water. Henry's law states that there is a direct relationship between partial pressure and gas solubility. When the partial pressure of a gas on or above a liquid increases, the solubility of the gas in the liquid increases. Gases dissolve in water frequently: a good example is soda, where carbon dioxide gas dissolves in water. When the soda bottle is closed, the partial pressure above the liquid is high, and so gas solubility is high as well. When the soda bottle is opened, the partial pressure decreases, and the solubility of the gas also decreases. Bubbles form, because much of the gas cannot dissolve any more. Henry's law is also important in Scuba diving. As the diver goes deeper under the water, there is more and more pressure, and so more and more gas can dissolve in their blood. If the scuba diver comes to the surface too quickly, gas will bubble out of their blood, causing decompression sickness or the bends. This can be treated using a decompression chamber, which increases the pressure on the scuba diver, and so it adjusts the gas pressure and the gas solubility.
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The presentation of the information is very good, but I want to point out that the simplification of the diver's example has more to it and if one wants to understand why gasses come in and out of solution while scuba diving, should seek further explanation. I know the video is not about scuba diving, but if there are scuba divers watching - this video is not showing a good explanation how gasses are dissolved in blood. It is because of the pressure change indeed, but it is more specific of the ambient pressure acting on the gasses when breathing and that the internal pressure within the body changes at different rate than the outside environment or the ambient pressure. Yet it explains very well Henry's law which gives a good understanding. Thanks for the video.
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