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I know there are many different representations of temperature, there's 4, 1) Fahrenheit 2) Kelvin 3) Celsius then there's 4) T = 460 + F

In my fluid dynamics review book To calculate specific weight γ= P(pressure) / (R * T) = lb/ft^3, it explained that T should be absolute temp so I used 2) kelvin, but the book used 4) T = 460+F

Can somebody explain what 460 + F stands for??

Thanks,

Peter