Calibration of Thermometers

[Grayman]

Over the years waters around the world have acified and carbonated.

Has this changed the freezing and boiling points of the water? If so how do scientists adjust for Celsius drift?

I have always calibrated thermometers to freezing of water but no one has ever mentioned any adjustments for the changes in that water.

 

[Grayman]

I need to figure this out. If global water is carbonating and this changes the freezing point how does one adjust for the shifting freezing point of the water of which we use as a physical standard to adjust our thermometers to? How can one create accurate temperature trends if the instruments used to measure them are shifted every year due to physical changes to the base standard?

Is it too small to matter? I found a site that said that carbonated water freezes at -10C but the water obviously isn't comparable to the ppm co2 increases we see every year. It would be nice to see a study.

 

[QuickTwist]

This is some heavy shit.

 

[Turnevies]

The precise definitions of units can change over time... but I suspect the current scale is based on purified water (apparently its triple point). The changes will be so small anyway, that ancient thermometers weren't precise enough for it to make any significant difference

 

[Grayman]

The precise definitions of units can change over time... but I suspect the current scale is based on purified water (apparently its triple point). The changes will be so small anyway, that ancient thermometers weren't precise enough for it to make any significant difference

Yes but purifying the water will do nothing concerning the CO2. Water oxygenates when stirred by absorbing gas from the atmosphere and I am sure CO2 does the same. In fact tht os why plants and fish can survive in water at all.

It probably is a small difference but I still would like to know for sure.