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Assuming you are talking about Fahrenheit degrees, and only density effects, it's actually bigger than 1%/10F. The math is quite trivial, just turn your temperatures into absolute (Rankine scale) and divide them (the ideal gas law, more specifically Guy-Lussac's law, only have linear terms making things easy).
E.g.,
t0 = 70F = 529R
t1 = 60F = 519R
density change = t0/t1 = 529/519 = 1.019
In other words, 1.9% increase in density.
(Hey, admins, fix the [ code ] block in your php...)
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