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Slug (unit)

physical science Maturity 11-13 Next article →

A slug is a special unit used to measure mass. Mass is the amount of matter in an object.

This unit belongs to the British Imperial system. It is also used in the United States customary system. Scientists use different systems to measure the world. Some systems start with force, while others start with mass. The slug is part of a weight-based system. It helps engineers and scientists talk about how heavy things are.

How does a slug work? We can define it by how it moves. Imagine you push an object with one pound of force.

If the mass is one slug, it will accelerate. Acceleration means the object speeds up. In this case, it speeds up by one foot every second squared. This is a specific way to link force and mass. One slug is equal to 32.174 pounds at Earth's surface. This uses standard gravity to make the math work.

People have used different names for this unit over time. A British physicist named Arthur Mason Worthington created the name. He came up with "slug" before the year 1900. The name does not come from the slimy garden animal. Instead, it comes from the idea of a solid block of metal. This is like a metal slug or a projectile. It was not used widely for many decades after it was named.

There are many interesting facts about this unit and its relatives. In Australia, the slug is part of the Weights and Measures Act of 1960. This law helps define all official units in that country. There is also a much smaller version of the slug. This version is based on inches rather than feet. People sometimes call this tiny unit a blob. Other people call it a snail or a slinch.

Measuring mass can feel tricky because different systems exist. You might know about the metric system used in science. The slug is different because it belongs to the FPS system. This stands for feet, pounds, and seconds. Some old metric systems used similar units like the glug. The glug was equal to 980.665 grams. Other old units like the mug or the hyl were also used. These units all help us understand the weight of the world.

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