A "slug," in the context of mass, is a unit of measurement primarily used in the United States customary and British imperial systems. It is not a widely used unit and is considered somewhat archaic. The slug is used to measure mass and is defined as the mass that accelerates at a rate of one foot per second squared (1 ft/s²) when a force of one pound-force (1 lbf) is applied to it. In other words, a slug is the mass that results in an acceleration of 1 ft/s² when a force of 1 lbf is applied to it.
In the United Kingdom, a "hundredweight" (abbreviated as cwt) is a unit of weight or mass used in various industries and commerce. However, it's important to note that the UK hundredweight is different from the US hundredweight in terms of its value.
In the United Kingdom:
1 hundredweight (UK) = 112 pounds (lbs)
So, while the US hundredweight is equal to 100 pounds, the UK hundredweight is equal to 112 pounds. This difference in value is important to be aware of when dealing with weights and measurements, especially in international trade or when comparing British measurements to those used in the United States or other countries.