1 dalton
1.661 × 10⁻²⁷ kgMass · definition
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Mass
Just how heavy is 1 dalton?
Particles & molecules
1 Da
1 dalton
The quantity is exact as entered.
1.661 × 10⁻²⁷ kgMass in kilograms
0 kg
Proton
A proton is a positively charged particle found in the nucleus of atoms, made up of quarks.
1.673 × 10⁻²⁷ kgMass in kilograms
0 kg
Bar length measures mass, not physical size. Both bars start at zero kilograms (kg). Pictures identify the objects only.
A little perspective
The mass of a proton is about 1.01 times 1 dalton.
Measurements, assumptions & sources +
1 dalton
Mass: 1.661 × 10⁻²⁷ kg; definition.
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Proton
Mass: 1.673 × 10⁻²⁷ kg; measured constant.
Twice the approximately 0.8409 fm charge radius. The charge distribution has no hard boundary; the illustration is schematic.
NIST — 2022 CODATA fundamental constants
The marked mass is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
Compare 1 dalton with the mass of a proton. The notes below explain how each value was chosen.
Proton
1.673 × 10⁻²⁷ kgMass · measured constant
Twice the approximately 0.8409 fm charge radius. The charge distribution has no hard boundary; the illustration is schematic.
- Comparing
- Mass ↔ Mass
- Relative size
- The mass of a proton is about 1.01 times 1 dalton. The mass of a proton is approximately 0.728% greater than 1 dalton.
How to read the visual
The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.
- The mass of a proton: This is a measured value; check the notes for its source and scope.
Mass is distinct from weight: an object’s mass stays the same as gravity changes.
1.6605 × 10⁻²⁷ kgkilograms
3.6609 × 10⁻²⁷ lbpounds
1.6605 × 10⁻³⁰ ttonnes
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