A cryostat is a device used to maintain very low temperatures, often below -150 degrees Celsius. It is commonly used in scientific research to cool samples, such as biological tissues or materials, to study their properties at low temperatures. Cryostats can be found in laboratories and are essential for experiments in fields like physics, materials science, and biomedicine. These devices typically use liquid gases, such as helium or nitrogen, to achieve the desired cooling effect. Cryostats can be designed for various applications, including magnetic resonance imaging (MRI) and superconductivity research. Their ability to control temperature precisely makes them invaluable in many scientific investigations.