Since Plato is the percentage weight of sugar in solution and
this percentage doesn't vary with temperature, it isn't necessary
to mention temperature when talking about Plato measurements.
However, the specific gravity of a solution varies
with temperature making it necessary (and accurate) to
always specify the temperature when expressing SG. In the
absence of a temperature for a SG reading the standard calibration
temperature of 68°F (20°C) can be assumed, however,
many of the hydrometers available to homebrewers are still
calibrated to the older 60°F (15.6°C) standard.
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