100th anniversary of psychrometrics

The formula which underpins the relationship between temperature, humidity and dew point - the basis of all air conditioning calculations - marks its 100th anniversary.
At the time of writing, there were only a few days (hours) left to celebrate the centennial of the formula which defines the correlation between temperature, humidity and dew point.
On December 8, 1911, and less than a decade after the invention of air conditioning, Willis H. Carrier, presented the Rationale Psychrometric Formulae at the annual meeting of the American Society of Mechanical Engineers, thus laying the foundation of all air-conditioning calculations and scientific design used to this day. His invitation to the meeting marked the recognition of air conditioning as a formal branch of engineering. It is said that Carrier had his first inspiration for the formula while waiting for a train on a foggy night.