Daily Archives: June 13, 2014

Helium Atom — Atomic mass is the mass of a single atom. This is found by adding up all the protons, neutrons and electrons in the atom. One proton has a mass of 1,836 electrons. Since electrons barely change the outcome of the atomic mass, they are generally left out of the calculation. […]

How to Calculate Atomic Mass Tutorial

This entry was posted on June 13, 2014 by Todd Helmenstine (updated on July 7, 2026)

Karl Landsteiner — June 14 is Karl Landsteiner’s birthday. Do you know your blood type? The letter designation used in blood types was developed by Karl Landsteiner. He was the first to separate types of blood by identifying the antigens on the surface of blood cells. He found four different classifications or types: […]

Today In Science History – June 14 – Blood Types

This entry was posted on June 13, 2014 by Todd Helmenstine (updated on October 25, 2023)

Firework Color Elements — Learn how firework colors work, including the characteristic colors of elements and other chemistry that makes color and special effects.

How Do Fireworks Get Their Colors? Firework Colors Chemistry

This entry was posted on June 13, 2014 by Anne Helmenstine (updated on July 8, 2026)

Red & Blue Fire Tornado — It’s fun and educational to make a tabletop fire tornado or fire vortex. Why not experiment with color, too? The easiest variation is the green fire tornado, but you can use other chemicals and a similar technique to get other colors or even multiple colors. This fire tornado showcases red […]

Make a Tabletop Fire Tornado: Red and Blue Flames

This entry was posted on June 13, 2014 by Anne Helmenstine (updated on August 25, 2021)