Some scientists hypothesize that we make color corrections to see items as stable colors under different lighting. Some people, the theory goes, discount cool colors, therefore seeing tennis balls as yellow. People who discount warm colors, on the other hand, see them as green.
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Historically, balls were either black or white in colour, depending on the background colour of the courts. In 1972 the ITF introduced yellow tennis balls into the rules of tennis, as research had shown these balls to be more visible to television viewers.Broadcasting tennis in color brought the matches to life, but it made tracking the ball on screen difficult — especially when it fell near the white courtlines. So the International Tennis Federation (ITF) undertook a study that found that yellow tennis balls were easier for home viewers to see on their screens.
Why do tennis balls have nitrogen
Pressurized tennis balls are filled with either air or nitrogen, with nitrogen keeping the balls inflated longer. On the other hand, non-pressurized balls are solid, which keeps them from deflating. However, non-pressurized tennis balls wear and tear at a quicker rate than pressurized balls.
