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Slug

The slug is a unit of mass used primarily in the U.S. customary system and British engineering contexts.

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  1 slug = 32.174 pounds (lb) (mass)

  
  
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  Equivalent to approximately 14.5939 kilograms (kg)

  
  
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  Defined so that when a force of one pound-force (lbf) acts on a mass of one slug, it accelerates at 1 ft/s² (using $F = ma$ in imperial units).

  
  

Key Facts:

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  Used mainly in physics and engineering for calculations involving Newton’s second law in imperial units

  
  
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  Allows consistent use of pound-force and pound-mass without extra conversion factors

  
  
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  Useful in dynamics, ballistics, and engineering mechanics

  
  

The slug bridges the gap between force and mass in the imperial system, making calculations easier when using pound-force units.

Proton Mass

The proton is a subatomic particle found in the nucleus of atoms. Its rest mass is approximately 1.673 × 10⁻²⁷ kilograms (or about 938.3 MeV/c² in energy units).

Protons, along with neutrons, make up the atomic nucleus and play a crucial role in chemistry and nuclear physics.

Summary:

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  Rest mass ≈ 1.673 × 10⁻²⁷ kg

  
  
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  Equivalent to about 938.3 MeV/c²

  
  
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  Fundamental constituent of atomic nuclei