Potassium, K

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Potassium, K
Categories:	Metal; Nonferrous Metal; Pure Element
Material Notes:	Physical Form: Soft Silver-White Metal; Cubic
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Physical Properties	Original Value	Comments

Density	0.602 g/cc @Temperature 1000 °C
	0.653 g/cc @Temperature 800 °C
	0.702 g/cc @Temperature 600 °C
	0.751 g/cc @Temperature 400 °C
	0.774 g/cc @Temperature 300 °C
	0.797 g/cc @Temperature 200 °C
	0.820 g/cc @Temperature 100 °C
	0.855 g/cc @Temperature 20.0 °C
	0.873 g/cc @Temperature -73.0 °C
	0.894 g/cc @Temperature -173 °C
	0.909 g/cc @Temperature -270 °C
Vapor Pressure	0.150 bar @Temperature 590 °C
	0.500 bar @Temperature 710 °C
	1.00 bar @Temperature 770 °C
	2.00 bar @Temperature 850 °C
	5.00 bar @Temperature 950 °C
	10.0 bar @Temperature 1110 °C
	20.0 bar @Temperature 1240 °C
	40.0 bar @Temperature 1420 °C

Chemical Properties	Original Value	Comments
Atomic Mass	39.0983	1995
Atomic Number	19
Thermal Neutron Cross Section	2.7 barns/atom
X-ray Absorption Edge	3.43645 Å	K
	36.352 Å	L_I
	42.02 Å	L_II
	42.452 Å	L_III
Critical Temperature	1950 °C
Electrode Potential	-2.92 V
Electronegativity	0.82	Pauling
Ionic Radius	1.33 Å	Crystal Ionic Radius for Valence +1
Electrochemical Equivalent	1.46 g/A/h

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.00000649 ohm-cm @Temperature 0.000 °C
	0.00000720 ohm-cm @Temperature 20.0 °C
	0.00000922 ohm-cm @Temperature 63.0 °C	solid
	0.00001395 ohm-cm @Temperature 63.0 °C	liquid
	0.00001464 ohm-cm @Temperature 77.0 °C	liquid
Magnetic Susceptibility	5.2e-7	cgs/g

Thermal Properties	Original Value	Comments
Heat of Fusion	61.55 J/g
Heat of Vaporization	2077 J/g
CTE, linear	83.0 µm/m-°C @Temperature 20.0 - 100 °C
Specific Heat Capacity	0.532 J/g-°C	Gas
	0.724 J/g-°C
Thermal Conductivity	99.2 W/m-K
Melting Point	63.25 °C
Boiling Point	759 °C
Heat of Formation	0.000 kJ/mol	Crystal
	89.0 kJ/mol	Gas

Component Elements Properties	Original Value	Comments
Potassium, K	100 %

Descriptive Properties
CAS Number	7440-09-7

References for this datasheet.

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