True or false: Non-condensables in a recovery cylinder can cause the pressure to be higher than expected at a given temperature.

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Non-condensables in a recovery cylinder raise the pressure at a given temperature because they are gases that do not condense with the refrigerant. When a cylinder contains both refrigerant vapor and non-condensables (like air), the total pressure reflects the contribution of all gases present. The refrigerant has its own saturated vapor pressure at that temperature, but the non-condensables add extra pressure that cannot condense away, so the overall pressure ends up higher than the refrigerant’s pure-vapor pressure. This is why charts that assume pure refrigerant don’t match the measured pressure if non-condensables are present. So the statement is true, and the idea that it only happens at high temperatures or that it’s unknown isn’t correct.