What do Dewar containers primarily hold?

Dewar containers are specifically designed for the storage and transport of cryogenic liquids, which are substances that exist at very low temperatures. These containers are constructed with an inner container that is insulated by a vacuum, minimizing heat transfer and allowing them to maintain the extremely low temperatures necessary to keep liquefied gases, such as liquid nitrogen and liquid helium, in their liquid form. This capability is essential for applications in various fields, including medicine, physics, and industrial processes, where maintaining low temperatures is crucial for the stability and handling of certain materials. The design and purpose of Dewar containers make them unsuitable for holding regular liquids, aerosolized gases, or combustible solids, as these materials do not require the specialized insulation and low-temperature capabilities that Dewar containers provide.