Does a baseball fly farther in hot weather or cool weather?

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Dear Tom,
When a baseball is hit by a ball player, does the ball travel farther in
hot weather or in cool weather?
Allen Dickerson

Dear Allen,
Actually, four factors affect the distance a baseball will travel: wind,
humidity, temperature and air pressure. Wind blowing toward (as opposed
to with) a baseball slows its forward motion and causes it to fall
sooner. Air with a higher humidity (actually, a higher dewpoint) is
slightly less dense than drier air and so the higher the humidity, the
farther a ball will travel. And in answer to your question, the density
of air decreases with increasing temperature. Therefore, the higher the
temperature, the farther a baseball will travel. Finally, air pressure
is also a factor. Lower air pressure (as, for example, at higher
elevations) means air is less dense and will result in longer baseball
flight distances.

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