Buys Ballot's law

noun

Buys Bal·lot's law | \ ˈbīsbəˈläts-, ˈbȯis-\

Definition of Buys Ballot's law

: a law in meteorology: when an observer'sback is to the wind the lower barometric pressure is to the observer's left in the northern hemisphere and to the observer's right in the southern hemisphere owing to rotation of the earth

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