Conversion Factors, Material Properties and Constants Related to
Telescope Design
Contents
This page is no longer maintained. It has been largely
superceded by MatWeb.
Conversion factors
This table gives conversion
factors to convert various units to their SI equivalents. It will not
be very useful for people who prefer to use cgs or English units
although it can be used to convert from SI to those systems.
Material properties
This table gives
engineering material properties such as density, heat capacity and
thermal conductivity listed alphabetically for common engineering and
other materials. The units are SI.
Physical constants
This is a short list of physical constants in SI units.
|
Avogadro's number
|
N
|
6.02E+23
|
mole-1
|
|
Boltzmann constant
|
k
|
1.381E-23
|
J/K
|
|
Electric charge
|
e
|
1.602E-19
|
coul
|
|
Gas constant
|
R
|
8.3145
|
J/K*mole
|
|
Gravitation
|
G
|
6.672E-11
|
N*m^2/kg^2
|
|
Mass
|
electron
|
9.11E-31
|
kg
|
|
Mass
|
proton
|
1.67E-27
|
kg
|
|
Mass
|
neuton
|
1.68E-27
|
kg
|
|
Mass
|
alpha-particle
|
6.64E-27
|
kg
|
|
Plank's
|
h
|
6.626E-34
|
J*s
|
|
Plank's
|
hc
|
1.986E-25
|
J*m
|
|
Plank's
|
hc/k
|
1.439E-02
|
m*°C
|
|
Radiation constant
|
hc^2
|
5.955E-17
|
W*m^2
|
|
Speed of light
|
c
|
2.998E+08
|
m/s
|
|
Stefan-Boltzmann
|
sigma
|
5.6705E-08
|
W/m^2*K^4
|
Astronomical constants
This is a short list of astronomical constants in SI units.
|
Acceleration
|
Sea level
|
9.8067
|
m/s^2
|
|
Luminosity
|
Sun
|
3.826E+26
|
J/s
|
|
Mass
|
Sun
|
1.989E+30
|
kg
|
|
Mass
|
Earth
|
5.976E+24
|
kg
|
|
Pressure
|
Sea level
|
1.013E+05
|
Pa
|
|
Radius
|
Earth
|
6.371E+06
|
m
|
|
Radius
|
Sun
|
6.970E+08
|
m
|
|
Velocity
|
Earth's orbital
|
2.978E+04
|
m/s
|
Date created: 9/26/95
Last modified: 12/13/02
Copyright © 1995, 1996, 1997, 1998 Walter A. Siegmund
Walter A. Siegmund
siegmund@astro.washington.edu