Using a simplified calculation you will be able to work out the increase/decrease in the pressure of a scuba cylinder with the change in its temperature.

+/- 1 degree Celcius equates to a pressure change of 0.6 bar in the cylinder. This is based on Charles Law that gas expands when heated and contracts when cooled. Because the cylinder is inflexible at these pressures the pressure exerted against the walls alters based on the gas's temperature. 

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