|
Symbol
Si |
|
State
Solid |
|
Atomic
Weight
28.086 |
|
Boiling
Point p.b., °C
2,878* |
|
Melting
Point, m.p., °C
1,412+2 |
|
Critical
Temperature, Tc, °C
4.886* |
|
Critical
Pressure, Pc,
atm
530* |
|
Critical
Volume, Vc, cm^3, /gx
mol
232.6* |
|
Critical
Density, Dc,
g/cm^3
0.1207* |
|
Vapor
Pressure, mm
Hg
2.8 x 10-4 (@ m.p.) |
|
Heat
of Vaporization,
cal/g
3,812 (@ m.p.) |
|
Heat
of Sublimation,
cal/g
4,075 (@ m.p.) |
|
Heat
of Fusion,
cal/g
264* (@ m.p.) |
|
Liquid
Heat Capacity, cal/g mol °C
6,755 (@ m.p.) |
|
Solid
Heat Capacity, cal/g x mol °C
4.78 (@ 25°C) |
|
Solid
Heat Capacity, JKg/m c °C
703 |
|
Liguid
Density,
g/cm^3
2.533 (@ m.p.) |
|
Solid
Density,
g/cm^3
2.329 (@ 25°C) |
|
Percent
Expansion on
Freezing
10% (@ m.p.) |
|
Surface
Tension,
Dynes/cm
736 (@ m.p.) |
|
Liquid
Viscosity,
Centipoises
0.88 (@ m.p.) |
|
Liquid
Thermal Conductivity, cal/sec x cm x °C
1.025 x 10^-3 (m.p.) |
|
Solid
Thermal Conductivity, cal/sec x cm x °C
0.353 (@ 25°C) |
|
Solid
Thermal Conductivity, W/m x °C
163 |
|
Hardness,
Knoops,
Kg/mm
1150 |
|
Hardness,
mohs
7 |
|
Compressibility
Coefficient,
cm^2/dyne
1.0 (10^-12) |
|
Bulk
Modulus,
dyne/cm^2
9.8 (10^11) |
|
Bulk
Modulus,
Gpa
102 |
|
Youngs,
Modulus,
dyne/cm^2
1.3 (10^12) |
|
Youngs,
Modulus,
Gpa
131 |
|
Coefficient
of Thermal Expansion, per °C
2.6 (10^-6) |
|
Specific
Heat, cal/g °C
0.18 |
|
Atomic
Density, atoms
cm^3
4.96 (10^22) |
|
Refractive
Index, 4m
3.4255 |
|
Dn/dT,
°C
1.6 (10^-4) |
|
%
Transmission Uncoated, 4m
53.8 |
|
Transmission
Range, m
1.27-7 & 45-100+ |
|
Dielectric
Constant
11.8 |
|
Elastic
Constants, C11,
dyne/cm^2
1.656 (10^12) |
|
Elastic
Constants, C12,
dyne/cm^2
0.639 (10^12) |
|
Elastic
Constants, C44,
dyne/cm^2
0.795
(10^12) |
|
Rupture
Modulus, Bending,
Kg/cm^2
700-3.500 |
|
Breaking
Strength, Compression
Kg/cm^2
4,900-5,600 |
|
Breaking
Strength, Compression,
MPa
120 |
|
Poisson
Ratio
0.28 |