ALMA (ESO / NAOJ / NRAO) / EUROPEAN SOUTHERN OBSERVATORY / SCIENCE PHOTO LIBRARY ALMA (ESO / NAOJ / NRAO) / EUROPEAN SOUTHERN OBSERVATORY / SCIENCE PHOTO LIBRARY
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Atmospheric pressure difference. Water bottles demonstrating atmospheric pressure differences. The two crushed bottles (seen with two filled bottles) were sealed at the ALMA Array Operations Site (AOS) at 5000 metres elevation. They were then brought down to the higher pressure found at ALMA's Operations Support Facility (OSF) at 2900 metres elevation. ALMA (Atacama Large Millimeter/sub-millimeter Array) is an array of 66 radio antennas located at the AOS on the arid Chajnantor plateau in the Chilean Andes. Initial antenna transport from the OSF to the AOS took place in 2008 and 2009. Photographed in March 2009.
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