The pressure inside a domestic pressure cooker typically ranges from 10 to 15 pounds per square inch (psi) or 0.7 to 1.0 bar. This pressure is higher than the atmospheric pressure at sea level, which is around 14.7 psi or 1.0 bar. By increasing the pressure inside the cooker, the boiling point of water also increases, allowing food to cook faster and more efficiently. The higher pressure also helps to tenderize tough meats and cook certain foods that require high temperatures. However, it's essential to use pressure cookers safely and follow the manufacturer's guidelines to prevent accidents or injuries.