Yes, a pressure cooker could potentially explode if it is directly thrown into a pool of chilled water after it's taken off the stove. This is because of a sudden and drastic change in temperature, which can cause a rapid decrease in pressure inside the pressure cooker.
When food is cooked in a pressure cooker, steam builds up inside the sealed pot, and the pressure increases as a result. The high pressure and temperature help to cook the food quickly and efficiently. However, when the pressure cooker is removed from the stove and subjected to a sudden temperature change, such as being immersed in cold water, the steam inside the pot can condense rapidly.
As the steam condenses, it turns back into water, which takes up significantly less space than steam. This rapid reduction in pressure inside the pressure cooker can create a vacuum effect, causing the sides of the pressure cooker to collapse inward or, in extreme cases, potentially leading to an explosion.
To avoid such dangerous situations, it is essential to follow proper safety procedures when using a pressure cooker. Always release the pressure inside the cooker gradually and safely before opening the lid. Allow the pressure cooker to cool down naturally after use, or follow the manufacturer's guidelines for quick-release methods. Never attempt to cool down the pressure cooker quickly by submerging it in cold water or using other abrupt cooling methods.