Answer:
By heating in a closed system.
Liquids can reach higher temperatures in a pressure cooker than in an unsealed pot by the application of heat to the pressure cooker.
A pressure cooker is usually tightly closed with no surrounding air interference which helps to maintain the temperature and increase in the elastic collision of particles. The increase in particle collision helps the liquid in the pot to attain a higher temperature.
However, heating in an unsealed pot makes the interference of surrounding air with it very possible which will definitely slow down the particle collisions and reduce the temperature and pressure due to the both of them being directly proportional to each other.
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