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John McDevitt

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Chemistry

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Chemistry
Chemistry : Temperature and dissolution Temperature and dissolution

by Muyanga Ziba

Global warming has been attributed to the greenhouse effect. Over the last fifty years temperatures of the northern and southern hemispheres have been rising as a result of green house gas emissions, Geologists Professor Maarten de Wit and Jacek Stankiewicz from Cape Town University have said. There is increased precipitation levels, increased cloud cover and water vapour concentr...read more

Chemistry
Flash point - What is it, and what's its relevance?

by Michael Capraro

Flash point is the lowest temperature at which a flammable liquid evolves sufficient vapor to form an ignitable mixture of thos...read more

Chemistry
Why is platinum so called?

by Alex Kleinschmidt

Platinum has been known to man for longer than you may think. For centuries it was used by Native Americans for applications in...read more

Chemistry
A guide to Helium II

by Dean L. Sinclair

Helium 4 has two liquid forms. Helium I, which is a "normal liquid," and Helium II, "He4II," to which it sharply converts at 2....read more

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