Air resistance, or drag, is a force that opposes an object’s motion through the air. When objects fall, gravity pulls them downward while air resistance pushes back, slowing them down. How much air resistance an object experiences depends on itsmass,surface area, and theshape of the object...
Google says that balloons make sense for this purpose — they're cheap to deploy and can provide wireless coverage in areas that would otherwise be difficult to serve due to geography. Like Google's driverless cars, Project Loon is very much an experiment that's in "very early days." ...