Pressure change with temperature in Fahrenheit: convert to rankine by adding 460, and work in absolute pressure.
The formula: P2 = P1 x T2/T1 with R = F + 460 and absolute pressure. Change any box and the full working updates. For study only, never for dive planning.
The IMCA ADS, BDS and LST papers ask this as a four-option question, with a calculator on screen. A free account gives you 15 practice questions for each exam, each with the worked answer and the document it comes from.