2.9.6
DEFINITIONS & FORMULAS CHAPTER 9 GEODIMETER SYSTEM 600
At 20°C dry air temperature 0.1 ppm corresponds to an
approximate change of:
• dry temperature: 0.1°C
• air pressure: 0.3 mbar
• relative humidity: 10%
• wet temperature: 1.3°C
At 40°C dry air temperature 0.1 ppm corresponds to an
approximate change of:
• dry temperature: 0.1°C
• air pressure: 0.3 mbar
• relative humidity: 4%
• wet temperature: 0.8°C
As shown in the first example above relative humidity has
quite a small influence on the ppm factor. It's much more
important to be precise when it comes to dry temperature
and air pressure. In hot regions relative humidity becomes
more important, though.
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