Speed of Sound

Speed of sound
The speed of sound is a term used to describe the speed of sound waves passing through an elastic medium.
The speed varies with the medium employed (for example, sound waves move faster through water than through air), as well as with the properties of the medium, especially temperature.
The term is commonly used to refer specifically to the speed of sound in air.
At sea level, at a temperature of 21 degrees Celsius (70 degrees Fahrenheit) and under normal atmospheric conditions, the speed of sound is 344 m/s (1238 km/h or 770 mph).
The speed varies depending on atmospheric conditions; the most important factor is the temperature.
Humidity has little effect on the speed of sound, nor does air pressure by itself. Air pressure has no effect at all in an ideal gas approximation.
This is because pressure and density both contribute to sound velocity equally, and in an ideal gas the two effects cancel out, leaving only the effect of temperature.Sound usually travels more slowly with greater altitude, due to reduced temperature..
The information provided was found from the website (http://www.sciencedaily.com/articles/s/speed_of_sound.htm)

"The speed of sound is something we learned during our unit on waves. The speed of sound is the disturbance through a medium. The speed of sound is different through different types of objects or substances. For example the speed of sound of air depends among the properties in air. It differs that from the speed of sound through various types of materials such as solids. The speed of sound in solids is greater then that of liquids. The speed of sounds in liquids is greater then that of gases. The speed of sound is one aspect we learned about when we took up our unit on waves. These were the different properties and aspects assosaited with the speed of sound."