| 摘要 |
A pressure-liquefiable gas or vapor fed into the interior of a container which may constitute the fuel tank of a power unit for a model aircraft or other working model, is condensed within the container by introducing either a liquid derived from said gas or vapor or a liquid refrigerant from an external source into the interior of a hollow condensing element mounted in the container with its outer surface in contact with said gas or vapor inside the container, and then exhausting the contents of the condensing element to cool the outer surface thereof to a temperature below the condensation temperature of said gas or vapor.
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