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Slug (unit)

physical science Maturity 11-13 Next article →

A slug is a way to measure mass. Mass is how much stuff is in an object. People use this unit in the United States. It is also used in the British system. This unit is part of a group called the FPS system. This name stands for feet, pounds, and seconds.

How do we define a slug? Imagine you push an object. If you use one pound of force, the object moves. A slug will speed up by one foot every second. This speed change is called acceleration. One slug is a very heavy mass. On Earth, one slug weighs about 32 pounds.

Where does the name come from? A man named Arthur Mason Worthington chose it. He picked the name before the year 1900. It does not come from the slimy animal. Instead, it means a solid block of metal.

There is also a tiny version of this unit. It is based on inches. Some people call this small unit a blob. Others call it a snail or a slinch. These names help people talk about very small masses.

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