Sound can be described as a pressure disturbance that travels through the constituent particles of a medium: as one particle of the medium is perturbed by the pressure, it exerts a force on an adjacent particle, thus perturbing that particle in turn....

The distance through a defined medium covered by a sound wave per unit time. The speed varies with the medium through which the energy is transmitted and its density. In air at standard temperature and pressure the speed of sound is 344 m/sec....

The speed of sound is variable and depends mainly on the temperature and the properties of the substance through which the wave is traveling. For example, in low molecular weight gases, such as helium, sound propagates faster compared to heavier gases,...

ROBERT GEBELOFF, Staff Writer The Record (Bergen County, NJ) 02-19-1995 THE SPEED OF SOUND -- MORE MACHINES ARE STARTING UP WHEN SPOKEN TO By ROBERT GEBELOFF, Staff Writer Date: 02-19-1995, Sunday Section: BUSINESS Edition: All Editions -- Sunday Is it about time...

When the experimental space-rock band Hovercraft plays you'll hear sheets of metallic guitar, jagged disruptive rhythms, and a restless onslaught of over-the-top supersonics: 40 minutes with no stops or long pauses. You'll see very little of the trio -- guitarist Campbell 2000, bassist Sadie...

Today is Friday, April 20, the 110th day of 2007. There are 255 days left in the year.Today's Highlight in History:On April 20, 1999, the Columbine High School massacre took place in Littleton, Colo., as two students shot and killed 12 classmates and one teacher...

Today is Monday, Oct. 15, the 288th day of 2007. There are 77 days left in the year.Today's Highlight in History:On Oct. 15, 1917, Dutch dancer Mata Hari, convicted of spying for the Germans, was executed by a French firing squad outside Paris.On this date:In...