RPM is the acronym used for revolutions per minute. It measures the number of revolutions completed in one minute around a fixed axis, giving the speed of a mechanical component. It is commonly used to describe the performance of automobile engines.
Like most ballparks built from the 1990s onward, Safeco Field is a 'retro-modern' style ballpark that incorporates many of the features of ballparks built in the 1950s and earlier with modern amenities.
Additionally, the Astrodome was the primary venue of the Houston Livestock Show and Rodeo from 1966 until 2002. It opened in 1965 as Harris County Domed Stadium and was nicknamed the  Eighth Wonder of the World .n 1971, the Astros installed an all-AstroTurf infield, except for dirt cutouts around the bases. This sliding pit configuration was first introduced by Cincinnati with the opening of Riverfront Stadium on June 30, 1970. It was then installed in the new stadiums in Philadelphia in 1971, and Kansas City in 1973.