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isopiestic
isopiestic adj. 
/ˌaɪsəpaɪˈɛstɪk/, /ˌaɪsoʊpiˈɛstɪk/, /ˌaɪsoʊpaɪˈɛstɪk/ [Greek πιέζειν to press, squeeze] representing, having, or characterized by equal or constant pressure; also as n., a line in a diagram representing states of equal pressure.
Brit. /ˌʌɪsə(ʊ)pʌɪˈɛstɪk/
, /ˌʌɪsə(ʊ)pʌɪˈɛstɪk/U.S. /ˌaɪsəpiˈɛstɪk/
, /ˌaɪsəpiˈɛstɪk//ˌaɪsəpaɪˈɛstɪk//ˌaɪsoʊpiˈɛstɪk//ˌaɪsoʊpaɪˈɛstɪk/ΘΠ
the world > matter > gas > air > [noun] > air-pressure > line in diagram indicating equal
isopiestic1873
isobar1892
isobaric1903
the world > matter > gas > air > [adjective] > under pressure > relating to constant pressure
isopiestic1873
isobaric1903
1873 J. W. Gibbs in Trans. Connecticut Acad. Arts & Sci. II. 311 In the same way we may conceive of lines of equal pressure... These lines we may also call..isopiestic.
1873 J. W. Gibbs in Trans. Connecticut Acad. Arts & Sci. II. 313 To prove that the ratio is independent of the shape of the circuit, let us suppose the area..divided up by an infinite number of isometrics..with equal differences of volume dv, and an infinite number of isopiestics..with equal differences of pressure dp.
1902 Encycl. Brit. XXXIII. 283/2 The isothermals..coincide with the iso-piestics for a saturated vapour in presence of its liquid.
1940 S. Glasstone Text-bk. Physical Chem. ix. 622 If two vessels containing different solutes in the same solvent are placed side by side in a closed space, vapor will distil from the solution of higher vapor pressure and condense in the one having the lower pressure until, when equilibrium is attained, both solutions are exerting the same pressure, that is to say they are isopiestic.
1966 R. Joel Basic Engin. Thermodynamics i. 80 The pressure remains constant throughout the process. It is often referred to as an isobaric or isopiestic process.
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