How Big Is A Piece Of Chocolate?

Quick Overview

The smallest piece of chocolate that everyone would agree is chocolate, possessing the necessary ratio and makeup of its approximately 300 to 800 constituent molecules, is calculated to be a zeptoliter, though the smallest amount a human can actually taste is much larger, around 10 to the power of -3 meters or a coarse grain of silt.

Key Points: Astronauts report that space has a distinctive odor, described as like burnt steak, hot metal, or gunpowder, which they notice upon returning to the ISS airlock. Two main theories exist for the smell of space: polycyclic aromatic hydrocarbons (PAHs) floating from dying stars, or the creation of ozone when atomic oxygen interacts with re-pressurized air. The scent of the Milky Way's dust cloud, Sagittarius B2, contains ethyl formate, which smells like raspberries and rum, making the galaxy smell like a raspberry daiquiri. The word "odd" might originate from Old Norse where it meant a sharp point, relating to the third point of a triangle, while the coincidence of "odd" having three letters and "even" having four is an example of an autological word. Chewing gum, being a viscoelastic fluid, can theoretically be folded an unlimited number of times until it degrades, but if layers are kept separate (like in pastry), a hard upper limit of less than 30 folds exists before layers become thinner than a single molecule. Chocolate is a mixture containing 300 to 800 different chemicals, lacking a single 'chocolate molecule,' meaning its smallest indivisible unit is defined by the necessary ratio of these components, estimated at a volume of a zeptoliter (10^-21 liters). The threshold for human taste requires hundreds of billions of molecules, meaning the smallest detectable piece of chocolate is on the order of 10^-3 meters, or a coarse grain of silt.

Context: The discussion begins by addressing a listener question about whether space has a smell, leading into a broader exploration of how scientists use spectroscopy to detect molecules with known odors in distant cosmic objects. The conversation then shifts to etymology, analyzing the origins of the words 'even' and 'odd' and introducing the concept of autological words and the related Grelling-Nelson paradox. Finally, the host tackles the titular question about the smallest possible piece of chocolate, detailing what defines chocolate chemically and contrasting it with elemental substances.