Physical and Chemical Constants
- Practical Electron Microscopy and Database -
- An Online Book -

http://www.globalsino.com/EM/  



 

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.

 

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Physical and chemical constants 
Comments
a0 (Bohr radius) 0.053 nm
c ligh speed in vacuum = 3 × 108 m/s The speed of light in vacuum
1 barn 10-24 cm2
1 Degree (°) 0.017453293 radian [rad]
1 keV 1.6 x 10-16 J
1 kcal/mol 4.184 kJ/mol Or convert with excel file
1 kJ/mol 0.010364512 eV/bond Or convert with excel file
1 MeV/cm 1.602 x 10-11 J/m
1 Pa (pascal) 0.00001 bar = 1 x 10-5 bar Pa is in the SI system.
1 Pa (pascal ) 0.0075006375541921 Torr ≈ 7.5 x 10-3 Torr
1 Pa 1 newton/m2
1 mmHg (10-3mHg) 1 torr
1 radian [rad] 57.3 Degree (°)
1 angstrom (Å)  1 x 10-10 m
1 nm   1 x 10-9 m
1 oz 0.00625 lb 
1 g 0.035274 oz
ε0 8.854 × 10−12 farad/m Permittivity of of vacuum
µ0 4π × 10−7 henry/m Permeability of vacuum
h 6.626 x 10-23 ergs/sec,
or 6.626 x 10-34 m2 kg / s
Planck's constant
hc 1239.84 eV nm h: Planck's constant; c: Speed of light.
λ (nm)
wavelength of radiation Wavelength of photons

 

 

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