Why does milk steamed in a pressure cooker not boil over?

Ah ok. On my previous indian pressure cookers, the whistles were 2-3 minutes apart, so 15 whistles would be 30-45 minutes of pressure cooking (the whistles start once the cooker has reached pressure). That’s why I’m wondering what the benefit is to pressure cooking the tea — 45minutes to cook chai is a long time!

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