Now that the sun has finally returned, I am noticing all the streaks, smears, and dust marks on the glass around my home.

As the hot steam cools and condenses to water, a vacuum is created inside the can and atmospheric pressure will crush it. 250 ml water to a 5 gallon can 20 min to boil, 1 or 2 min to collapse.

In every kitchen, the pressure cooker stands out as both a time-saving hero and, at times, a source of unease. Known for ...