free expansion

noun Thermodynamics.
the expansion of a gas into an evacuated space without the transfer of heat or the performance of work.
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Example sentences
Pipes shall be so installed as to permit free expansion and contraction without damage to joints or hangers.
Any restraint to the free expansion or contraction of the material will result in an apparent strain.
The construction of the setting around each blowoff pipe shall permit free expansion and contraction.
Pipes must be installed as to permit free expansion and contraction without damage to joints or hangers.
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