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A heavy, colorless, chemically inactive, monatomic gaseous element used for filling radio, television, and luminescent tubes. Symbol: Xe, at. wt.: 131.30, at. no.: 54.

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Compressed Gas

A gas or mixture of gases having, in a container an absolute pressure exceeding 40 psi at 21.1°C (70°F)

Atmosphere

A unit of pressure, the pressure that will support a column of mercury 760 mm high at 0 °C.

Condensed States

The solid and liquid states.

Low Spin Complex

Crystal field designation for an inner orbital complex, contains electrons paired t2g orbitals before eg orbitals are occupied in octahedral complexes.

Calorimeter

A device used to measure the heat transfer between system and surroundings.

Features of the Scanning Tunneling Microscope

The scanning tunneling microscope (STM) invented by Heinrich Rohrer and Gerd Binnig in the 1980s still manages to do a great job today and competes with more advanced microscope types.

The scanning tunneling microscope is used for studying the surface atoms that are found on various materials. The device is based on a complex process of "tunneling" electrons between the material and the tip of a probe.

Corrosion

Oxidation of metals in the presence of air and moisture.

Semipermable Membrane

A thin partition between two solutions through which certain molecules can pass but others cannot.

Formula Unit

The smallest repeating unit of a substance. The molecule for nonionic substances

Nuclear Reactor

A system in which controlled nuclear fisson reactions generate heat energy on a large scale, which is subsequently converted into electrical energy.