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Summer Science: The Perfectly Toasted Marshmallow

Joe Palca's perfectly toasted marshmallow.
Maggie Starbard
/
NPR
Joe Palca's perfectly toasted marshmallow.

It's the epic quest of campers everywhere: How do you get the perfectly toasted marshmallow? In our inaugural installment of NPR's Summer Science series, we gave some guidance on the first key ingredient: how to build the campfire. (Later this summer, we'll attempt to answer the vexing question of how to stave off brain freeze.)

For the marshmallow-toasting tips, science correspondent Joe Palca again turned to Daniel Madryzkowski, a fire protection engineer from the National Institute of Standards and Technology.

Madryzkowski explains that there are two kinds of heat coming from the fire — the hot gases coming off the fire as flame (that's convective heat) and the radiant heat coming from the hot coals.

"You want to stay a little to the side of the flames, and also over an area where you see glowing coals," Madrzykowski says. The reason: It's hard to stay in the sweet spot of the dancing flames. "If you want to get it nice and toasted, you typically rely on radiant energy."

But even with Madryzkowski's supervision and pro tips, Joe still managed to torch his marshmallow. That led him to another crucial question: Why do they burn so well?

To find out, and to hear more from their camping adventure, click on the audio link above.

Copyright 2020 NPR. To see more, visit https://www.npr.org.

Joe Palca is a science correspondent for NPR. Since joining NPR in 1992, Palca has covered a range of science topics — everything from biomedical research to astronomy. He is currently focused on the eponymous series, "Joe's Big Idea." Stories in the series explore the minds and motivations of scientists and inventors. Palca is also the founder of NPR Scicommers – A science communication collective.
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