Anyone who’s used a can of compressed air to clean their computer or keyboard" /> Anyone who’s used a can of compressed air to clean their computer or keyboard" />

Why does compressed air can get cold

ERROR","inner_caption":false,"caption_position":false,"arrow_position":false,"toolbar":true,"infobar":false,"show_smallbtn":false,"idle_time":false,"click_content":false,"click_slide":false,"click_outside":false,"animation_duration":false,"transition_duration":false,"small_btn_template":""}" id="envira-gallery-12736" class="envira-gallery-public envira-gallery-justified-public envira-gallery-0-columns envira-clear">


You watching: Why does compressed air can get cold

*
*

*
*

*
*

Anyone who’s supplied a have the right to of compressed air to clean their computer system or key-board knows that the have the right to easily gets fairly cold to the touch. This Minute Physics video explores some of the thermodynamics behind that process. Henry initially identifies a few explacountries that don’t quite line up through monitorings, before focusing in on the contents of the can: 1,1-difluoroethane. Inside the sealed deserve to, this chemical sits in an equilibrium of part-liquid, part-vapor. But as soon as press is released by opening the nozzle, the liquid boils, generating additional vapor and cooling whatever before stays in the reservoir.

Although it’s not an excellent explanation for the compressed air can’s cooling, the cooling of an expanding gas is incredibly necessary in applications choose supersonic wind tunnels. That initially equation you view at 0:36 in the video (for isentropic adiabatic expansion) is key to what happens in a nozzle through supersonic circulation. As the flow accelerates to supersonic speeds, its temperature drops significantly. When I was in graduate college, we actually had actually to prewarm our hypersonic wind tunnel (in pretty a lot the exact same way you would prewarm your cooktop at home) prior to we ran at Mach 6 because otherwise the temperature inside the test area would drop so low that the oxygen would liquefy out of the air! (Image and also video credit: Minute Physics)




See more: Steam Is Stuck Installing Microsoft Vc Redist Package Steam, Microsoft Vc Redist Package Cannot Install

Share this:


Like this:


Like Loading...


See more: Fallout 3 Not Working On Windows 8 Fix <, Fallout 3 Game Problems In Windows 8

Tagged boiling, liquid dynamics, physics, rocket nozzle, scientific research, supersonic wind tunnel, thermodynamics

Blog post navigation