By determining the weight per linear foot of a material, you know how much any length of the substance weighs. The weight per foot is also known as linear weight density. This equals the weight in pounds of the object, such as a rope, divided by its total length in feet. For some applications, such as competitive sailing, it is important to know the weight per foot of rope to avoid adding too much weight to the sails.

- Scale
- Tape measure
- Calculator

Place the entire length of the object on a scale to determine its weight. For example, say you have 5 lbs. of rope.

Measure the length of the object in inches. Continuing the example, the length of the rope is 102 inches.

Convert the length to feet by dividing by 12. This would be 102 inches divided by 12 for a length of 8.5 feet.

Divide the weight by the length to obtain the linear weight density in pounds per foot. Completing the example, 5 lbs. divided by 8.5 feet equals 0.6 lb. per foot.

#### Things You'll Need

References

- "Physics for Scientists and Engineers with Modern Physics"; Raymond A. Serway and John W. Jewett; 2009

About the Author

William Hirsch started writing during graduate school in 2005. His work has been published in the scientific journal "Physical Review Letters." He specializes in computer-related and physical science articles. Hirsch holds a Ph.D. from Wake Forest University in theoretical physics, where he studied particle physics and black holes.