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# Volume of Cylinders

## V = πr^2h

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"Milk: It Does a Body Good"

Credit: Keith Weller/USDA
Source: http://commons.wikimedia.org/wiki/File:Dairy_cow.jpg

What do cows, cylinders, and volume all have in common? According to the U.S. Department of Agriculture, 36% of the people in the United States drink the recommended 2 to 3 glasses of milk per day. But how does the milk get from the farm to the store?

#### Why It Matters

A milk truck carries milk from dairy farms to processing facilities where the milk gets packaged so that it can be sold in stores. Milk trucks are a special type of tank truck. Their tanks are cylindrical in design, and the size of the cylinder directly impacts the amount of milk that can be transported.

Credit: Pedro Reyna
Source: http://www.flickr.com/photos/thebigtable/5683138960/

Most milk trucks have a tank with a capacity of 4,000-5,000 gallons. Tank trucks in general can carry up to 9,000 gallons of liquid. Whether you are a farmer or a truck driver for a milk company, the volume of the cylinder on the milk truck directly impacts your business, money, and consumers.

#### Explore More

Check out the first link for an activity on cylinders, volume, capacity, and packaging. Follow the instructions at the second link for a hands-on way to explore capacity with colored water and different-sized containers.

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1. [1]^ Credit: Keith Weller/USDA; Source: http://commons.wikimedia.org/wiki/File:Dairy_cow.jpg; License: CC BY-NC 3.0
2. [2]^ Credit: Pedro Reyna; Source: http://www.flickr.com/photos/thebigtable/5683138960/; License: CC BY-NC 3.0

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