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\nWhy Do Compressed Air Cans Get Cold?\n

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\nThis video is about compressed air cans (aka gas dusters) and why they get cold when you spray them. They cool off because the refrigerant inside (1,1-difluoroethane) is under pressure and boils off when the pressure lowers, and energy...\nThis video is about compressed air cans (aka gas dusters) and why they get cold when you spray them. They cool off because the refrigerant inside (1,1-difluoroethane) is under pressure and boils off when the pressure lowers, and energy lost to the latent heat of vaporization cools the can a lot. Difluoroethane normally boils at -25°C (-13°F), but under ~6 atm (6 bar, 600 kpa) it is a liquid at room temperature. The gas also cools off slightly due to the Joule-Thompson effect of fluid expansion through a throttled valve. Difluoroethane is heavier than air and water soluble, so it is recommended to use it in a ventilated environment to clean your keyboard, etc. Also, 1,1-difluoroethane is a potent greenhouse gas. It is also known as Freon 152a, Ethylidene difluoride, Ethylidene fluoride, HFC-152a, R-152a, and DFE.

Thanks to Tino and Hannah!

REFERENCES

CRC Air Duster Safety Data Sheet

Latent Heat of vaporization

1,1-difluoroethane chemical and physical properties

1,1-difluoroethane on wikipedia

Free Expansion of Real Gases, Goussard, 1993

Joule-Thompson Expansion Course Notes

Properties of 1,1-difluoroethane


Medical Effects of difluoroethane




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4:59
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12th - Higher Ed
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Science
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2019
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English
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expansion, energy, steam, water, equilibrium, space, pressure, cooling, engineering
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cans, spraying, pressure inside, boils, blowing, hotter, spray, letting, valve, inside, cool, science, nozzle, shake, difluoroethane, cold, cools, liquid, upside, experiments, passing, colder, room temperature, air coming, compressed air, physics, gas inside, boil, significantly
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