It was atmospheric pressure I knew of, most people do from studying science at school or listening to the weather report find out what the weather is going to be in order to plan their day, week or holidays.
About atmospheric railway and atmospheric perspective I knew nothing. One can gain general knowledge from their love of reading. Specialized knowledge is learning a particular subject well, so well that you can enter a competition like Mastermind. I am glad I have added atmospheric railway and atmospheric perspective to my bank of general knowledge.

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