Convert Atomic mass unit [u] to ton (long) [ton (UK)] Online | Free weight-and-mass Converter

Atomic Mass Unit [u]

The atomic mass unit (u), also known as the unified atomic mass unit or dalton (Da), is a standard unit of mass used to express atomic and molecular weights.

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  1 u = 1/12 the mass of a carbon-12 atom

  
  
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  1 u ≈ 1.66053906660 × 10⁻²⁷ kilograms

  
  
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  Symbol: u or Da

  
  

Key Facts:

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  Used to measure the mass of atoms, molecules, and subatomic particles

  
  
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  1 hydrogen atom ≈ 1 u

  
  
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  Mass of a proton ≈ 1.007 u, neutron ≈ 1.008 u

  
  
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  Simplifies comparison of atomic-scale masses in chemistry and physics

  
  

The atomic mass unit provides a convenient and consistent way to express and compare very small masses at the atomic and molecular scale.

Ton (Long) [ton (UK)]

The long ton, also known as the imperial ton or British ton, is a unit of mass traditionally used in the United Kingdom and some Commonwealth countries.

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  1 long ton = 2,240 pounds

  
  
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  1 long ton ≈ 1,016.0469 kilograms

  
  
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  Symbol: often written as ton (UK) or long ton

  
  
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  Historically used in shipping, freight, and coal industries in the UK.

  
  

Key Facts:

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  1 long ton = 2,240 lb

  
  
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  ≈ 1,016.05 kg

  
  
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  Heavier than the short ton (US, 2,000 lb)

  
  
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  Slightly heavier than the metric ton (1,000 kg)

  
  

Though largely replaced by the metric ton in most official UK uses, the long ton is still referenced in certain industries and historical contexts.