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===Vacuum pump oil barometer=== Using vacuum pump oil as the working fluid in a barometer has led to the creation of the new "World's Tallest Barometer" in February 2013. The barometer at Portland State University (PSU) uses doubly distilled vacuum pump oil and has a nominal height of about 12.4 m for the oil column height; expected excursions are in the range of Β±0.4 m over the course of a year. Vacuum pump oil has very low vapour pressure and is available in a range of densities; the lowest density vacuum oil was chosen for the PSU barometer to maximize the oil column height.<ref>Tomlinson, Stuart (February 10, 2013) [http://www.oregonlive.com/portland/index.ssf/2013/02/large_barometer_at_portland_st.html Large barometer at Portland State University could be the tallest in the world]. oregonlive.com</ref>
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