Dalton
Dalton (unit)
Dalton (symbol: Da), also known as the Unified Atomic Mass Unit (symbol: u), is a unit of mass widely used in physics and chemistry. It is defined as one twelfth of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state, and has a value of approximately 1.66053906660(50)×10−27 kg. The Dalton is named after the British scientist John Dalton, who is known for his work in the development of modern atomic theory.
Pronunciation
Dalton: /ˈdɔːltən/
Etymology
The term "Dalton" is derived from the name of the British scientist John Dalton, who proposed the atomic theory, which explains that all matter is composed of atoms, the smallest unit of an element that retains the properties of that element.
Related Terms
- Atomic mass unit: A unit of mass used to express atomic and molecular weights, equivalent to 1/12 of the mass of one atom of carbon-12.
- Mole (unit): The mole is the unit of measurement in the International System of Units (SI) for amount of substance. It is defined as exactly 6.02214076×10^23 particles, which may be atoms, molecules, ions, or electrons.
- Avogadro constant: The number of constituent particles, usually atoms or molecules, that are contained in the amount of substance given by one mole. It is exactly 6.02214076×10^23 particles per mole.
- Atomic theory: A scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms.
External links
- Medical encyclopedia article on Dalton
- Wikipedia's article - Dalton
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