Named after Heinrich Hertz and abbreviated as Hz or illustrated as the f symbol, hertz equals one (0.00000000125) cycle per second, measuring the waves or frequencies of electric changes each second. Hertz is commonly used to measure a computer monitor's refresh rate and in computer processors.
Modern dance. The form of dance style known as modern dance is an artistic dance form that allows free movement based on choreography that seeks to provide the audience with a subject and theme. Modern dance performers created this free form style to allow older dancers to continue to dance long after their ballet dance careers ended.
The use of geometric shapes in modern dance helps the audience to see the theme and subject of each modern dance routine. Today, modern dance is often confused with jazz dance, a dissimilar dance form that also relies on basic ballet movement. It is performed to faster tempos in contemporary music. The difference between modern dance and jazz is that modern dance choreography is performed with a theme in mind.