Rain’s Dirty Little Secret

More info: (See links below)
Produced by: Minute Earth
Year: 2013
Language: English
Region: Global

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Want to learn more about the topic in this week’s video? Here are some key words/phrases to get your googling started:
– Condensation – the process of water molecules glomming together into visible droplets
– Condensation nuclei – tiny solid particles that water vapor condenses onto (also called aerosols)
– Homogenous condensation – condensation without any kind of condensation nuclei
– Dew point – the temperature below which water vapor starts to condense into droplets
– Heterogenous condensation – condensation that happens with the help of condensation nuclei
– Critical Embryo – a cluster of water molecules big enough to easily gain more molecules
– Cloud chamber – a cool thing to check out if you want to build a particle detector at home (it involves pumping a bunch of water vapor into pure air; when a particle passes through, it leaves a streak of ionized water molecules that, in super-saturated air, can act as condensation nuclei!)


Knupp, K. Surface Thermodynamics and Nucleation of Water Droplets and Ice Crystals. Lecture Notes. Retrieved March 2015 from: http://vortex.nsstc.uah.edu/mips/pers…

McDonald, JE (1962) Homogenous Nucleation of Vapor Condensation. I. Thermodynamic Aspects. Institute of Atmospheric Physics, The University of Arizona, Tucson, Arizona.

McDonald, JE (1962) Homogenous Nucleation of Vapor Condensation. II. Kinetic Aspects. Institute

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