Search


	Podcast:		4. Chemistry and Physics
	Episode:		States of Matter
	Category:		Science & Medicine
	Duration:		00:01:16
	Publish Date:		2011-07-13 19:55:15
	Description:		Transcript: There are four basic states of matter in the universe. The temperatures of transition between them depend a little bit on the chemical substance or compound involved, but in general we can say that solids correspond to temperatures of up to one or two hundred Kelvin. The microscopic motions of the atoms and molecules are one or two kilometers per second, and these substances emit far infrared thermal radiation. Liquids are somewhat hotter, temperatures of three or four hundred Kelvin. Microscopic motions are two or three kilometers per second and liquids also emit far infrared thermal radiation. Gases are hotter still, temperatures of six hundred Kelvin up to a thousand Kelvin or so. Microscopic motions are three or four kilometers per second for the atoms or molecules, and thermal radiation is in the infrared region of the spectrum. The hottest materials are called plasmas. These range up from three thousand Kelvin up to many thousands of Kelvin. The microscopic motions are ten kilometers per second or larger, and the type of thermal emission from a plasma is visible radiation or ultraviolet radiation.
	Total Play:		0