Cheatsheet
Frequently used constants
| Boltzmann constant | \(k_{\text{B}} = 1.380649 \times 10^{-23} \mathrm{\,J\,K^{-1}}\) |
k
|
| Planck constant | \(h = 6.62607015 \times 10^{-34} \mathrm{\,J\,s}\) |
h
|
| Reduced Planck constant | \(\hbar = 1.054571817 \times 10^{-34} \mathrm{\,J\,s}\) |
hbar
|
| Elementary charge | \(e = 1.602176634 \times 10^{-19}\mathrm{\,C}\) |
e
|
| Avogadro constant | \(N_{\text{A}} = 6.02214076 \times 10^{23}\mathrm{\,mol^{-1}}\) |
N_A
|
| Atomic mass constant | \(m_{\text{u}} = 1.66053906660 \times 10^{-27}\mathrm{\,kg}\) |
value('atomic mass constant')
|
Length
| \(1 \,\text{Bohr} = 0.529177210903 \times 10^{-10} \,\text{m}\) |
value('Bohr radius')
|
| \(1 \,\text{Ang} = 1.88972612462577 \,\text{Bohr}\) |
value('Angstrom star')
|
Energy
| \(1 \,\text{eV} = 1.602176634 \times 10^{-19} \,\text{J}\) |
value('electron volt')
|
| \(1 \,\text{Ry} = 2.1798723611035 \times 10^{-18} \,\text{J}\) |
value('Rydberg constant times hc in J')
|
| \(1 \,\text{Ry} = 13.605693122994 \,\text{eV}\) |
value('Rydberg constant times hc in eV')
|
| \(1 \,\text{Hartree} = 2 \,\text{Ry} = 4.359744722207 \times 10^{-18} \,\text{J}\) |
LaTeX
Coding
Computer and system settings
MacOS
Adjust the spacing of menu bar apps
To adjust
the spacing of menu bar apps, open the Terminal and run the
following commands: Normally, the value of 8 looks good.
And you need a logout or restart to take effect. To see the current
settings if you have set them: 1
2defaults -currentHost write -globalDomain NSStatusItemSpacing -int 8
defaults -currentHost write -globalDomain NSStatusItemSelectionPadding -int 8 To cancel the changes:
1
2defaults -currentHost read -globalDomain NSStatusItemSelectionPadding
defaults -currentHost read -globalDomain NSStatusItemSpacing1
2defaults -currentHost delete -globalDomain NSStatusItemSelectionPadding
defaults -currentHost delete -globalDomain NSStatusItemSpacing