The density, specific heat, melting point of tin
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General information about tin
Tin — metal, which is included in subgroup IV Germany 5th group of the periodic system of elements Mendeleev. Characteristically, usually contained in the nature of tin represented by ten different isotopes which have different mass numbers: from tin-112 (distribution of less than one percent) to the weakly radioactive tin-125 (prevalence around 6%). Most common tin-120 (32,97%), tin-118 (24,01%) and tin-116 (14,24%).
Tin is soft and technologically fit to the plastic deformation of metal: it is easily forged and stamped at normal temperatures and melts easily. Laminated in a cold state Lavagna foil may have a thickness of 5 µm.
Tin allotropes: ordinary white β-tin is stable at temperatures
in excess of 13.2 °C. is less than 13.2 °C is stable α- tin, which has a gray color. At temperatures in excess of 161 °C, tin becomes brittle, and easily ground to powder. The same thing happens when tin is cooled to ∼200 °C.
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The basic physical properties of tin
They are listed below:
Crystal structure of the α (cubic), β (tetragonal)
Melting point, °C 231,9
Boiling point, °C 2270
Changes in volume when switching grey tin into white, % 27
Specific heat at 0−100 °C, cal/(g°C) 0,054
Thermal conductivity, cal/(.°C), 0.157 inch
Temperature coefficient of thermal conductivity at 20−100 °C103 -0,7
The coefficient of linear expansion 22,410−6 (solid)
Thermal expansion in the liquid state 10010−6
Specific conductivity, m/Оммм2 8,95
Specific electrical resistivity, Оммм2/m 0,124
Temperature coefficient of resistivity 0,0044
The resistivity in the liquid state (300 °C), Ohm/cm3 4910−3
The surface tension at 300 °C, dyn/cm 526
The modulus of elasticity (at 0 °C), MPa 55000
The modulus of elasticity (at 100 °C), MPa 48000
The elastic modulus (at 200 °C), MPa 36000
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