Maybe it’s raining less than we thought : physicists make a splash with raindrops discovery
ScienceDaily (June 11, 2009)
It’s conventional wisdom in atmospheric science circles : Large raindrops fall faster than smaller drops because they have a greater terminal speed — i.e., the speed when the downward force of gravity is exactly the same as the upward air resistance.
Now two physicists from Michigan Technological University and colleagues at the Universidad Nacional Autónoma de México (National University of Mexico) have discovered that it ain’t necessarily so.
Some smaller raindrops can fall faster than bigger ones. In fact, they can fall faster than their terminal speed. In other words, they can fall faster than drops that size and weight are supposed to be able to fall.
And that could mean that the weatherman has been overestimating how much it rains.
Page publiée le 24 juin 2009, mise à jour le 2 août 2014