A gas can be liquefied at temperature T ...

A gas can be liquefied at temperature T and pressure P provided `"_____________"`.

`T = T_(c ) ` and `P lt P_(c ) `

`T lt T_(c ) ` and `P gt P_(c ) `

`T gt T_(c ) ` and `P gt P_(c ) `

`T gt T_( c ) ` and `P lt P_(c ) `

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