Monthly Archives: November 2017




Jan Ingenhousz (1730 - 1799)
December 8 is Jan Ingenhousz’s birthday. Ingenhousz was a Dutch scientist who made the first step to understanding plant respiration or photosynthesis. English chemist Joseph Priestly had recently demonstrated that plants give off oxygen. Ingenhousz expanded this research by noting that plants not only give off oxygen but absorb carbon […]

Today In Science History – December 8 – Jan Ingenhousz ...



December 7 marks the passing of Walter Noddack. Noddack was a German chemist who searched for two elements missing from Mendeleev’s periodic table. The two blank placeholder elements appeared underneath manganese called eka-manganese and dvi-manganese. (eka means 1 and dvi means 2 in Sanskrit). Together with Ida Tacke (who would […]

Today In Science History – December 7 – Walter Noddack   Recently updated !





Table salt is hygroscopic and may be deliquescent at high temperature and humidity. (Artem Beliaikin)
Deliquescence Definition Deliquescence refers to the property of a substance to absorb water from the air to dissolve itself and form an aqueous solution. Materials with this property are termed deliquescent. Deliquescent materials are a class of hygroscopic substances. Other types of hygroscopic materials may absorb water, yet not dissolve. In order to be deliquescent, […]

Deliquescence Definition and Examples – Absorbing Water and Dissolving



Data from Comet 67P/Churyumov-Gerasimenko or the Rosetta Comet tells us how a comet smells. ESA/Rosetta/MPS for OSIRIS Team
The Rosetta probe made incredible discoveries about comets by taking measurements of  67P/Churyumov-Gerasimenko. Its ROSINA instrument (Rosetta Orbiter Sensor for Ion and Neutral Analysis) included two mass spectrometers that determined how a comet smells. If you think it smells like a dirty snowball, guess again (unless you find that snowball at […]

What Does a Comet Smell Like?