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Why Don't Fire Hydrants Freeze and Explode?

Pipes can freeze in the winter, but you never hear about fire hydrants freezing. What makes them safe from the cold temperatures in winter time?

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Sources:

http://www.todayifoundout.com/index.php/2014/08/reason-fire-hydrants-dont-freeze-winter/
http://media.cygnus.com/files/base/FHC/document/2011/09/weeklydrills34final_10461393.pdf
http://media.cygnus.com/files/base/FHC/document/2011/11/weeklydrills43final0_10457995.pdf
https://www.livescience.com/43408-why-do-freezing-pipes-burst.html
https://www.plumbingsupply.com/residential-water-pressure-explained.html
http://www.firehydrant.org/info/faqs_ask7.html
https://books.google.com/books?id=GUXyAAAAQBAJ&pg=PA495

Images:

https://en.wikipedia.org/wiki/File:Downtown_Charlottesville_fire_hydrant.jpg
https://en.wikipedia.org/wiki/File:Dry_hydrant.jpg
https://commons.wikimedia.org/wiki/File:Hydrant_Insel_Krk_Kroatien.jpg
https://commons.wikimedia.org/wiki/File:Hydrant_in_Jerusalem.jpg
https://commons.wikimedia.org/wiki/File:Berlin_hydrant_20050211_p1000517.jpg
https://en.wikipedia.org/wiki/File:1869BirdsillHollyHydrantSideTop.jpg
https://commons.wikimedia.org/wiki/File:Fire_hydrant_UK.jpg

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