September 11, 2014 - Science Notes and Projects

Old-barometers — Pressure is a measurement of force per unit area. Unfortunately, there are many different units associated with pressure. The SI unit for pressure is the pascal (Pa). One pascal is equal to one newton per square meter (N/m2). One pascal is a very small amount of pressure, so the kilopascal (kPa) […]

Pressure Conversions – mmHg to kPa Tutorial

This entry was posted on September 11, 2014 by Todd Helmenstine (updated on January 20, 2022)

The Element Song lists the chemical elements of the periodic table. Tom Lehrer set the names of the elements to the tune of “I Am The Very Model Of A Modern Major-General” from the Gilbert and Sullivan opera buffa “The Pirates of Penzance.” Learning the lyrics is a fun way […]

The Element Song Lyrics

This entry was posted on September 11, 2014 by Anne Helmenstine (updated on June 21, 2021)

Rudolf Jakob Camerarius — September 11 is Harvey Fletcher’s birthday. Fletcher was an American physicist responsible for many contributions to sound and speech technology. While working for Bell Telephone Laboratory, Fletcher centered his research into human speech and hearing. He built the first practical audiometer to measure hearing loss and the first electronic hearing […]

Today In Science History – September 11 – Harvey Fletcher

This entry was posted on September 11, 2014 by Todd Helmenstine (updated on June 21, 2021)