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SDSS Engineering

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This page is no longer maintained. It has been largely superceded by MatWeb.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