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gastight

Adjective

Meaning

So tightly fitted as to preclude the escape of gas; impervious to gas.

Source: Webster's dictionary

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Examples

Meanwhile, the discovery of hydrogen led Joseph Black in c. 1780 to propose its use as a lifting gas, though practical demonstration awaited a gastight balloon material. Source: Internet

Each kind used a thin gastight metal envelope, rather than the usual rubber-coated fabric envelope. Source: Internet

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