Can Santa Really Climb Down the Chimney?

By: John Fuller  | 
santa getting down chimney
Could Santa have perfected miniaturization technology in order to fit into a chimney? zbruch/Getty Images

­By the time the holiday season is in full swing, curious, knowledge-seeking children have lots of questions about Santa Claus and Christmas. How does Santa make it around the world in one night? Do reindeer really fly? Why do people keep giving us fruitcakes?

One of the most difficult questions that parents face has nothing to do with reindeer flight or the physics of Santa Claus' flight path — it's a practical matter concerning a chimney. After all, when Santa drops by your house to deliver his presents, he doesn't knock on your door or break any windows in the process. Instead, after landing his sleigh on your roof, Santa climbs down the chimney, stuffs your stockings, places gifts under the tree and takes a quick milk-and-cookies break before climbing back up the chimney.


But how does Santa get down your chimney in the first place? Can he even fit into a chimney? Does he drop straight down, or does he use special climbing equipment? And what happens if you don't even have a chimney? Does that mean people without chimneys don't get any presents at all?

Although no one may ever know for sure just how Santa operates, we at HowStuffWorks have what we think is the most logical explanation for how the big guy might be able to navigate a small space: science, in the form of miniaturization technology. What does this mean? It's actually as simple as it sounds — Santa could use this technology to actually shrink the size of his body.­

Michael C. LaBarbera, a professor emeritus of organismal biology and anatomy and geophysical sciences at the University of Chicago, explained that reducing the distance between molecular bonds could work for movie monsters and other creatures that need to get small in a hurry. There's a lot of empty space between the nucleus of an atom and the electrons surrounding it, so moving everything closer together could potentially decrease the size of an object, but leave the object's mass unchanged.

"If volume decreases but mass does not, then density must increase," he wrote. "An object the size of a cell but the mass of a submarine ... is going to pass through the table, the floor, and the earth's mantle like a hot knife through butter." So, that may explain any loud crashes that might come from the fireplace if Santa slipped. If it can work for movie monsters, maybe it can work for Santa!

But what about his suit? If he compresses his body to a small enough size to fit through the chimney, wouldn't the suit just crumple into a pile since it isn't a part of him? Santa's suit would need to be threaded with carbon nanotubes. This would allow the suit to compress as Santa himself compresses. His belt would also be equipped with a grappling hook, making his descent into your living room a bit smoother.

If there's no chimney, of course, he could just open your front door and walk right in — sometimes you have to go low-tech. But a chimney entrance would be preferable since it's the most direct path from the roof to the Christmas tree. Plus, there's the show-off factor — what else would you expect from a guy who can travel around the world in one night?


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  • LaBarbera, Michael C. " Biology and Geometry Collide!" University of Chicago Library. (Dec. 1, 2021)