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Triple Point of Water Using an SPRT, learn more...

Question asked by tomc on Sep 18, 2012
See how the triple point of water and other liquids are measured in a metrology lab. The triple point of water is defined as .01 degrees Celsius. At it's triple point water will exist as a liquid, a solid (ice) and a gas (vapor). In order to measure the temperature a Ponds Engineering K51 thermal electrically cooled core is used to lower the temperature below -8 degrees C. The core is then warmed to the triple point. A SPRT and an Agilent 34420A Micro-ohm meter is used to measure the temperature. The 34420A Micro-ohm meter has a low current mode which will reduce the measurement errors due to thermal warming. Watch this interesting video:

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