picometres
Atomic bond lengths
Picometres is the plural of picometre, a unit of length equal to one trillionth of a metre.
At this scale, picometres measure atomic and subatomic distances—the radius of a hydrogen atom is about 53 picometres.
The American spelling is picometers.
Ten-billionths of meters
- covalent bondsElectron-sharing chemical connections
- atomic nucleiCentral atomic masses
- subatomicSmaller than atoms
- wavelengthsPeak-to-peak distances in waves
crystallography · van der Waals · atomic scale · quantum mechanics · electron clouds · spectroscopy · atomic physics
International system of measurement
- metric systemDecimal-based measurement standard
- trillionthsMillionths of millionths
- scientific notationNumbers times ten-powers
- precisionAccuracy of measurement
instrumentation · calibration · conversion · microscale · quantification · standardization · metrology · accuracy
angstroms
Ten-billionths of meters
- covalent bondsElectron-sharing chemical connections
- atomic nucleiCentral atomic masses
- subatomicSmaller than atoms
wavelengths · crystallography · van der Waals · atomic scale · quantum mechanics · electron clouds · spectroscopy · atomic physics
SI units
International system of measurement
- metric systemDecimal-based measurement standard
- trillionthsMillionths of millionths
- scientific notationNumbers times ten-powers
precision · instrumentation · calibration · conversion · microscale · quantification · standardization · metrology · accuracy · magnitude
picometreslight-years
Units of astronomical distance
parsecs · lightyears · astronomical units · megaparsecs · cosmic distances