The thermodynamics behind why your electronics cleaner turns freezing
In short: Ever wonder why a can of compressed air feels like an ice pack the moment you spray it? This video explains the physics of phase changes and gas expansion that turn a simple cleaning tool into a cooling agent.
The primary reason for the temperature drop is the latent heat of vaporization. The refrigerant inside, 1,1-difluoroethane, is kept as a liquid under high pressure (about 6 atm). When you spray it, the pressure drops rapidly, causing the liquid to boil into a gas. This phase change requires energy, which is pulled from the surrounding environment—including the can itself—causing a significant cooling effect.
The video also explores the Joule-Thompson effect, where a fluid cools as it expands through a throttled valve. While both effects contribute, the boiling process is the dominant driver. Because 1,1-difluoroethane is heavier than air and water-soluble, the video notes that these cans should be used in ventilated areas.
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- Summary by Intellect · source: Why Do Compressed Air Cans Get Cold?
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