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Updated: May 13, 2025
There was at=20first a hissing sound when he opened the valve, and it grew colder in the lock, since air absorbs heat from surrounding objects when it expands. We were glad to draw sweaters on over our heads. It also grew as misty as a London fog as the water-vapour in the air was condensed. At last the hiss of escaping air ceased. The door to the modern dungeon of science grated open.
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