Forum Discussion
MEXICOWANDERER
Nov 13, 2017Explorer
This was a finding, not an accident.
750 ml measuring column. Pyrex. 300 mm tall
Fill with new electrolyte. Titrate to 1.280 SG adjusted to 20c.
Place on concrete slab. Temp 10F - 30F
Air temp at center of column 50F - 75F
Temperature quickly fell as thermocouple temp was lowered center of column to floor but was never less than 12 to 15 degrees warmer than the concrete. There was no fan air movement present.
Sample reposed for (Cannot remember exact time but around three months).
However I do remember the final gravity as being 1.205 top 20 mm.
Opinion. Even though it sat in a relative temperature gradient the effect was clearly defined. The test was conducted off-site in an unused garage
A few years later, I measured the same column (stoppered) for a year at 40-90F and found an inconsequential amount of gradient differential.
Apparent is the evidence that Delta T between concrete pad and air temperature is key. Not the temperature itself.
750 ml measuring column. Pyrex. 300 mm tall
Fill with new electrolyte. Titrate to 1.280 SG adjusted to 20c.
Place on concrete slab. Temp 10F - 30F
Air temp at center of column 50F - 75F
Temperature quickly fell as thermocouple temp was lowered center of column to floor but was never less than 12 to 15 degrees warmer than the concrete. There was no fan air movement present.
Sample reposed for (Cannot remember exact time but around three months).
However I do remember the final gravity as being 1.205 top 20 mm.
Opinion. Even though it sat in a relative temperature gradient the effect was clearly defined. The test was conducted off-site in an unused garage
A few years later, I measured the same column (stoppered) for a year at 40-90F and found an inconsequential amount of gradient differential.
Apparent is the evidence that Delta T between concrete pad and air temperature is key. Not the temperature itself.
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