metalresearcher
National Hazard
Posts: 758
Registered: 7-9-2010
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What scale is this hydrometer ?
I have a hydrometer with a somewhat weird scale. Putting it in clear water it exactly levels to the thick 'METHANOL' line, but what do the numbers
-1.2, -1.7, -2.3, etc. mean ?
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unionised
International Hazard
Posts: 5126
Registered: 1-11-2003
Location: UK
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I think it's for antifreeze.
Adding ethylene glycol to water will raise the density of the solution.
Adding methanol will lower the density.
The scales are calibrated in freezing points.
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