Question

why does the whistle of pressure cooker Rises up?​

Answer 1

Usually pressure cookers whistle because you have the heat turned up too high. The whistle is on a spring loaded pressure vent and when the pressure vent opens to the whistle the whistle starts to scream. It is a warning to turn the heat down a bit. It is meant to tell you that you are wasting energy and you should turn the heat down to the right cooking temperature to maintain the proper pressure, which you will be a little bit above. By the way, the louder the whistle is can be used to indicate roughly how far above the right cooking pressure you are. There should also be a couple of lines, either on the shaft of the whistle tube or on a separate button that rises as the pressure rises. These indicate your normal range of cooking pressure.

The whistle does not mean the pressure cooker is about to explode, there are other pressure relief valves that will open and prevent and explosion although if they do open there will be a mess to clean up.

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Answer 2

when the water inside the pressure cooker boils then the vapour exerts pressure on the Wall of the cooker called vapour pressure. vapour pressure push the whistle of the cooker and hence it rise up.