PhysicalConstants

java.lang.Object
- cern.clhep.PhysicalConstants

```
public class PhysicalConstants
extends Object
```
High Energy Physics coherent Physical Constants. This class is a Java port of the C++ version found in CLHEP 1.4.0, which in turn has been provided by Geant4 (a simulation toolkit for HEP).
For aliasing see physicalConstants.

Field Summary

Fields
Modifier and Type	Field and Description
`static double`	`alpha_rcl2`
`static double`	`amu`
`static double`	`amu_c2`
`static double`	`Avogadro`
`static double`	`Bohr_radius`
`static double`	`c_light`
`static double`	`c_squared`
`static double`	`classic_electr_radius`
`static double`	`e_squared`
`static double`	`electron_charge`
`static double`	`electron_Compton_length`
`static double`	`electron_mass_c2`
`static double`	`elm_coupling`
`static double`	`epsilon0`
`static double`	`fine_structure_const`
`static double`	`h_Planck`
`static double`	`halfpi`
`static double`	`hbar_Planck`
`static double`	`hbarc`
`static double`	`hbarc_squared`
`static double`	`k_Boltzmann`
`static double`	`kGasThreshold`
`static double`	`mu0`
`static double`	`neutron_mass_c2`
`static PhysicalConstants`	`physicalConstants` Little trick to allow for "aliasing", that is, renaming this class.
`static double`	`pi`
`static double`	`pi2`
`static double`	`proton_mass_c2`
`static double`	`STP_Pressure`
`static double`	`STP_Temperature`
`static double`	`twopi`
`static double`	`twopi_mc2_rcl2`
`static double`	`universe_mean_density`

Method Summary
- Methods inherited from class java.lang.Object
  equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - physicalConstants
```
public static final PhysicalConstants physicalConstants
```
    Little trick to allow for "aliasing", that is, renaming this class. Normally you would write
```
 PhysicalConstants.twopi;
 PhysicalConstants.c_light;
 PhysicalConstants.h_Planck;
 
```
    Since this class has only static methods, but no instance methods you can also shorten the name "PhysicalConstants" to a name that better suits you, for example "P".
```
 PhysicalConstants P = PhysicalConstants.physicalConstants; // kind of "alias"
 P.twopi;
 P.c_light;
 P.h_Planck;
 
```
  - pi
```
public static final double pi
```
    See Also:
    
    Constant Field Values
  - twopi
```
public static final double twopi
```
    See Also:
    
    Constant Field Values
  - halfpi
```
public static final double halfpi
```
    See Also:
    
    Constant Field Values
  - pi2
```
public static final double pi2
```
    See Also:
    
    Constant Field Values
  - Avogadro
```
public static final double Avogadro
```
    See Also:
    
    Constant Field Values
  - c_light
```
public static final double c_light
```
    See Also:
    
    Constant Field Values
  - c_squared
```
public static final double c_squared
```
    See Also:
    
    Constant Field Values
  - h_Planck
```
public static final double h_Planck
```
    See Also:
    
    Constant Field Values
  - hbar_Planck
```
public static final double hbar_Planck
```
    See Also:
    
    Constant Field Values
  - hbarc
```
public static final double hbarc
```
    See Also:
    
    Constant Field Values
  - hbarc_squared
```
public static final double hbarc_squared
```
    See Also:
    
    Constant Field Values
  - electron_charge
```
public static final double electron_charge
```
    See Also:
    
    Constant Field Values
  - e_squared
```
public static final double e_squared
```
    See Also:
    
    Constant Field Values
  - electron_mass_c2
```
public static final double electron_mass_c2
```
    See Also:
    
    Constant Field Values
  - proton_mass_c2
```
public static final double proton_mass_c2
```
    See Also:
    
    Constant Field Values
  - neutron_mass_c2
```
public static final double neutron_mass_c2
```
    See Also:
    
    Constant Field Values
  - amu_c2
```
public static final double amu_c2
```
    See Also:
    
    Constant Field Values
  - amu
```
public static final double amu
```
    See Also:
    
    Constant Field Values
  - mu0
```
public static final double mu0
```
    See Also:
    
    Constant Field Values
  - epsilon0
```
public static final double epsilon0
```
    See Also:
    
    Constant Field Values
  - elm_coupling
```
public static final double elm_coupling
```
    See Also:
    
    Constant Field Values
  - fine_structure_const
```
public static final double fine_structure_const
```
    See Also:
    
    Constant Field Values
  - classic_electr_radius
```
public static final double classic_electr_radius
```
    See Also:
    
    Constant Field Values
  - electron_Compton_length
```
public static final double electron_Compton_length
```
    See Also:
    
    Constant Field Values
  - Bohr_radius
```
public static final double Bohr_radius
```
    See Also:
    
    Constant Field Values
  - alpha_rcl2
```
public static final double alpha_rcl2
```
    See Also:
    
    Constant Field Values
  - twopi_mc2_rcl2
```
public static final double twopi_mc2_rcl2
```
    See Also:
    
    Constant Field Values
  - k_Boltzmann
```
public static final double k_Boltzmann
```
    See Also:
    
    Constant Field Values
  - STP_Temperature
```
public static final double STP_Temperature
```
    See Also:
    
    Constant Field Values
  - STP_Pressure
```
public static final double STP_Pressure
```
    See Also:
    
    Constant Field Values
  - kGasThreshold
```
public static final double kGasThreshold
```
    See Also:
    
    Constant Field Values
  - universe_mean_density
```
public static final double universe_mean_density
```
    See Also:
    
    Constant Field Values

Class PhysicalConstants

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

physicalConstants

pi

twopi

halfpi

pi2

Avogadro

c_light

c_squared

h_Planck

hbar_Planck

hbarc

hbarc_squared

electron_charge

e_squared

electron_mass_c2

proton_mass_c2

neutron_mass_c2

amu_c2

amu

mu0

epsilon0

elm_coupling

fine_structure_const

classic_electr_radius

electron_Compton_length

Bohr_radius

alpha_rcl2

twopi_mc2_rcl2

k_Boltzmann

STP_Temperature

STP_Pressure

kGasThreshold

universe_mean_density