| Heiti og tákn | Gildi |
|---|
| atómmassaeining (amu) | 1.6605402 × × 10 −27 kg |
| Tala Avogadros | 6.02214076 × × 10 23 mol −1 |
| Fasti Boltzmanns ( k ) | 1.380649 × × 10 −23 J K −1 |
| hlutfall hleðslu og massa fyrir rafeind ( e/m e ) | 1.75881962 × × 10 11 C kg −1 |
| grunneining hleðslu ( e ) | 1.602176634 × × 10 −19 C |
| hvíldarmassi rafeindar ( m e ) | 9.1093897 × × 10 −31 kg |
| Fasti Faradays ( F ) | 9.6485309 × × 10 4 C mol −1 |
| gasfasti ( R ) | 8.205784 × × 10 −2 L atm mol −1 K −1 = 8.314510 J mol −1 K −1 |
| mólrúmmál kjörgass, 1 atm, 0 °C | 22.41409 L mol –1 |
| mólrúmmál kjörgass, 1 bar, 0 °C | 22.71108 L mol –1 |
| hvíldarmassi nifteindar ( m n ) | 1.6749274 × × 10 −27 kg |
| Fasti Plancks ( h ) | 6.62607015 × × 10 −34 J s |
| hvíldarmassi róteindar ( m p ) | 1.6726231 × × 10 −27 kg |
| Fasti Rydbergs (R) | 1.0973731534 × × 10 7 m −1 = 2.1798736 × × 10 −18 J |
| ljóshraði (í lofttæmi) ( c ) | 2.99792458 × × 10 8 m s −1 |