NASA tracking Extra-Tropical Storm Sebastien towards the UK

NASA's Aqua satellite passed over eastern North Atlantic Ocean and captured an infrared view of what is now Extra-tropical cyclone Sebastien. Sebastien transitioned from a tropical storm to an extra-tropical storm on Nov. ...

NASA observes tropical storm Fung-Wong organize

As Tropical Depression 28W continued organizing and developing into Tropical Storm Fung-Wong in the Philippine Sea, NASA's Aqua satellite provided data on the storm to forecasters. In the Philippines, Fung-Wong is known as ...

NASA gets infrared view of Atlantic Halloween subtropical storm

The latest addition to the Atlantic Ocean hurricane season developed quickly. NASA's Aqua satellite passed over the eastern North Atlantic Ocean on Halloween and provided forecasters with an infrared view of Subtropical Storm ...

NASA gets infrared view of Atlantic Halloween subtropical storm

The latest addition to the Atlantic Ocean hurricane season developed quickly. NASA's Aqua satellite passed over the eastern North Atlantic Ocean on Halloween and provided forecasters with an infrared view of Subtropical Storm ...

NASA finds a tiny tropical storm Kiko

NASA's Terra satellite is one in a fleet of NASA satellites that provide data for research. Terra captured an image of Tropical Storm Kiko in the Eastern Pacific Ocean which showed the extent of the small storm.

NASA-NOAA satellite studies tropical storm Kiko's center

Hurricane Kiko weakened to a tropical storm, but imagery from NASA-NOAA's Suomi NPP satellite showed that the storm has maintained strength in the circular area of powerful storms around the low-level center.

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Convection

Convection is the movement of molecules within fluids (i.e. liquids, gases) and rheids. It cannot take place in solids, since neither bulk current flows nor significant diffusion can take place in solids.

Convection is one of the major modes of heat transfer and mass transfer. Convective heat and mass transfer take place through both diffusion – the random Brownian motion of individual particles in the fluid – and by advection, in which matter or heat is transported by the larger-scale motion of currents in the fluid. In the context of heat and mass transfer, the term "convection" is used to refer to the sum of advective and diffusive transfer. Note that in common use the term convection may refer loosely to heat transfer by convection, as opposed to mass transfer by convection, or the convection process in general. Sometimes "convection" is even used to refer specifically to "free heat convection" (natural heat convection), as opposed to forced heat convection. However, in mechanics the correct use of the word is the general sense, and different types of convection should be properly qualified for clarity.

Convection can be qualified in terms of being natural, forced, gravitational, granular, or thermomagnetic. It may also be said to be due to combustion, capillary action, or Marangoni and Weissenberg effects. Due to its role in heat transfer, natural convection plays a role in the stucture of Earth's atmosphere, its oceans, and its mantle. Discrete convective cells in the atmosphere can be seen as clouds, with stronger convection resulting in thunderstorms. Natural convection also plays a role in stellar physics.

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