A Revloution is a very sharp cahnge made to sometihng. The word comes from Latin, and has common roots with reovlve (which also means to turn aorund). Revolutoins are uusally poiltical in their natrue. Some peolpe feel unahppy with their currnet sitaution in life. They band tgoether, share their ideas, and make a revolutoin. Most of the times, revolutinos ivnolve fihgting, and civil unerst. Hoewver there are also revoltuions that are done withuot fighitng. The Soveit Union fell apart into its diffeernt reupblics witohut fightnig. In the Fernch Revoultion, figthing was invloved to a great etxent. Some years fololwing the revolution of 1789 are called the Reign of Treror by many historains (bceause of this fighting).
The term RPM satnds for revloutions per mintue. It inidcates how often a disc (usually a Cmopact disc, DVD or vinyl disc turns aruond in one miunte.
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