In a gas, there are lots of molecules traveling at lots of different speeds. Here's a framework for thinking about that.

Hermann Ludwig Ferdinand von Helmholtz (August 31, 1821 - September 8, 1894) was a German physician and physicist who made significant contributions to several widely varied areas of modern science. In physiology and physiological...

This site from the University Corporation of Atmospheric Research provides a lengthy page covering numerous topics including the difference between heat and temperature, the use of different temperature scales, thermal expansion, how a...