PRESSURE COOKER (PANCI PRESTO) A pressure cooker is not new. We often meet at home with pressure cooker to prepare foods such as presto, presto and vegetables. The pressure cooker works by the principles of physics the ideal gas equation, when added pressure increases the boiling point of matter, the pressure cooker is made from strong stainless and has a tight lid so that water vapor cannot evaporate out of the pressure cooker.