History of Hydrogen

	Revision 5 . . (edit) September 16, 2001 4:41 am by (logged).68.87.xxx
	Revision 4 . . May 17, 2001 10:56 pm by LA2
	Revision 3 . . (edit) March 13, 2001 10:17 am by Larry Sanger

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Difference (from prior major revision) (minor diff, author diff)

Added: 0a1,2

A chemical element, in the periodic table hydrogen has the symbol H and atom number 1.

Changed: 3c5

At normal STP-like conditions, hydrogen forms a diatomic gas, H2, with a boiling point of only 20.28 K and a melting point of 13.81 K. Under exceedingly high pressures, like those found at the center of gas giants, the molecules lose their identity and the hydrogen becomes a liquid metal. Under the exceedingly low pressure conditions found in space, hydrogen tends to exist as individual atoms, simply because there is no way for them to combine; clouds of H2 form and are associated with star formation.

At normal STP-like conditions, hydrogen forms a diatomic gas, H2, with a boiling point of only 20.28 K and a melting point of 13.81 K. Under exceedingly high pressures, like those found at the center of gas giants, the molecules lose their identity and the hydrogen becomes a liquid metal. Under the exceedingly low pressure conditions found in space, hydrogen tends to exist as individual atoms, simply because there is no way for them to combine; clouds of H2 form and are associated with star formation.

Changed: 7c9,13

Hydrogen combines with oxygen to produce water, H2O, and releases a lot of energy doing so, burning explosively in air. The name hydrogen, which comes from the French, in fact means water-maker, ultimately from the Greek.

Hydrogen combines with oxygen to form water, H2O, and releases a lot of energy in doing so, burning explosively in air. The name hydrogen, which comes from the French, in fact means water-maker, ultimately from the Greek. See: Periodic table