This is called the Jul-Thomson effect. When high pressure gas comes in relatively low pressure environment. That means the gas is expanding. As a result, the thermal energy of the gas was dispersed to a larger area. This is called the Jull-Thomson effect, which was first explained by James Jull and William Thomson. And there is only one way for gas to keep the thermodynamic gas formula (which says that a certain amount of gas at low pressure increases volume and it reduces the temperature of that gas) by reducing the temperature. When the air in the mouth comes out with a small hole and suddenly extends, but no heat is taken from the outside or taken out, the air cools according to this rule, but when the mouth is blowing open, why is the pressure of the gas changing? No, so it remains at body temperature (37 ° C). This non-heat exchanging process has a scientific name, 'Adiabatic Process'. Refrigerators and air conditioners work in this policy. In these machines, the gas is pressurized through the compressor pump and then released through a small hole, thus cooling the gas. This process continues in a cycle, causing the refrigerator to cool down.
Answered by
AL MaMun (4 Golds)
Friday, 06 Sep 2019, 09:37 PM
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