Which phenomenon impairs the performance of an oil diffusion pump when the boiler's heating rate is excessively high?

💡 Explanation

When the heating rate is too high, the pumping fluid in an oil diffusion pump's boiler overheats, causing rapid vaporization which overwhelms the nozzle and leads to hot fluid molecules flowing back towards the vacuum chamber. Therefore, backstreaming increases, rather than stalling, oxidation or clogging that rely on different processes and chemical conditions.

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