Explanation:

Pressure cooking is the process of cooking food, using water or other cooking liquid, in a sealed vessel known as a pressure cooker. This simulates the effects of long braising within a shorter time.  Almost any food that can be cooked in steam or water-based liquids can be cooked in a pressure cooker. The cooker works by trapping the steam produced from boiling the cooking liquid inside the vessel. This causes internal pressure and temperature to rise quickly. Food is cooked more quickly in a pressure cooker because at the higher pressure the boiling point of water rises from 100°C to 121°C . The hotter steam is able to transmit its thermal energy to the food at around 4 times the rate of conventional boiling.