Slug
The slug is a unit of mass used primarily in the U.S. customary system and British engineering contexts.
1 slug = 32.174 pounds (lb) (mass)
Equivalent to approximately 14.5939 kilograms (kg)
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:
Used mainly in physics and engineering for calculations involving Newton’s second law in imperial units
Allows consistent use of pound-force and pound-mass without extra conversion factors
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.
Deuteron Mass
The deuteron is the nucleus of deuterium, an isotope of hydrogen, consisting of one proton and one neutron bound together.
Its rest mass is approximately 3.344 × 10⁻²⁷ kilograms (about 1875.6 MeV/c²).
The deuteron plays a key role in nuclear physics and fusion reactions.
Summary:
Rest mass ≈ 3.344 × 10⁻²⁷ kg
Equivalent to about 1875.6 MeV/c²
Nucleus of deuterium (1 proton + 1 neutron)