Liquid gases are substances that exist in a liquid state at low temperatures and high pressures. Common examples include liquid nitrogen and liquid oxygen. These gases can be stored and transported in liquid form, making them useful for various applications, such as in cryogenics and industrial processes. When the pressure is released or the temperature rises, liquid gases can quickly vaporize back into their gaseous state. This property is utilized in many fields, including aerospace and medical industries, where they serve essential roles, such as in rocket propulsion and preserving biological samples.