Buys Ballot's law

== English == === Etymology === Named after C. H. D. Buys Ballot, Dutch meteorologist. === Proper noun === Buys Ballot's law (meteorology) A rule stating that, in the Northern Hemisphere, if a person stands with their back to the wind, the atmospheric pressure is low to the left and high to the right (because wind travels counterclockwise around low-pressure zones in the Northern Hemisphere).