Undercover work or covert operation regarding a secret matter, person, or group of interest.
The unofficial holiday of Mole Day is a joyous occasion for scientists, chemistry enthusiasts, and students alike, celebrated annually on October 23. This date, combined with the time, 6:02 am, holds a special significance as it represents the chemical constant known as Avogadro's number, approximately 6.02 × 10²³[1][3].
Avogadro's number is a fundamental concept in chemistry, representing the quantity of atoms, ions, or molecules in one mole of a substance. Named after the Italian scientist Amedeo Avogadro, this number has now become the cornerstone of the definition of the mole, a unit of measurement that defines the amount of a substance[1][3].
Before 2019, the mole was defined based on the amount of substance containing the same number of chemical units as there are atoms in 12 grams of carbon-12. However, as of May 20, 2019, the definition of the mole has been revised, and it is now based on the Avogadro number[1][3]. The presentation of this change was filmed at Unleash Space, Faculty of Engineering, Auckland University, and the video clip is from a presentation by the Measurement Standards Laboratory of New Zealand (MSL).
The video, produced by MSL to share the story of metrology development, was filmed before the 2019 revision of the SI definitions. It was edited by Jonathon Potton of Chillbox Creative, and published by Referencing Hub media. The video showcases how the Avogadro's number, fixed in a similar manner as Boltzmann's constant, Planck's constant, and electron charge, will now be used to define one mole instead of the mass of 12 grams of carbon-12[1][3].
Mole Day is celebrated from 6:02 (6:02 am) on October 23 (10/23) as a playful nod to 6.02 × 10²³, connecting the date and time to the mole concept directly[1][3]. This unofficial holiday is popular among chemists, chemistry students, and enthusiasts to promote interest in the subject.
[1] Measurement Standards Laboratory of New Zealand (MSL) YouTube Channel [3] Avogadro's number - Wikipedia
Scientists and health-and-wellness enthusiasts might find interest in the revised definition of the mole, as it now relies on Avogadro's number, a crucial concept in science and therapies-and-treatments. The unofficial holiday of Mole Day, with its connection to Avogadro's number, continues to be a means to promote science, particularly chemistry, among students and enthusiasts.
