Official Vintage Vintage Vintage 1990 Shirt

 Cooling soup is another matter. Now we purse our lips to block the outflow of air and to increase the pressure of air in our lungs and mouth. That results in what is called an isentropic expansion of the air in our lungs, which we cause by creating the pressure drop across our lips. On either side of the expansion nozzle formed by our mouth, the ratio of the absolute temperature of exiting air to that in our body varies roughly as the one-quarter power of the ratio of atmospheric pressure to that in our lungs. So the air emerges cooler. How much cooler depends on how hard we can blow. More than that, a relatively small pressure drop creates quite a fast moving jet, and even a very small jet entrains a great deal of air. Thus what crosses the soup spoon is largely room air, drawn in by the jet. While our breath truly is cooler now, the soup is largely cooled by room air.

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Official Vintage Vintage Vintage 1990 Hoodie

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