The only published scientific data on the effect of humidity on baseballs known to the authors is contained in Robert Adair's book The Physics of Baseball: "long flies hit with balls stored under conditions of extreme humidity could be expected to fall as much as 30 feet short of the distance expected for normal balls."1 In this paper we report on our measurements of the coefficient of restitution of baseballs as a function of the humidity at which they have been stored.
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