sealing
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CT: Tidal, river, solar, and geothermal power stations exhibit specific operating conditions that represent very different challenges to sealing technology. Whereas hot, toxic thermal oil can be securely sealed in solar thermal power stations, geothermal applications need to control hot and strongly abrasive thermal water under high pressure.

S: https://www.eagleburgmann.com/en/solutions/power-plant-technology/renewable-energies (last access: 25 November 2016)

N: From seal (“design stamped on wax,” especially one attached to a document as evidence of authenticity, c. 1200, from Old French seel “seal on a letter” -Modern French sceau-, from Vulgar Latin *sigellum; an earlier borrowing directly from Latin is represented by Old English insigel; technical use, “what prevents the escape of a gas or liquid” is from 1853) and -ing (suffix used form the present participle of verbs, and adjectives derived from them, from Old English present participle suffix -ende).
2. A tight and perfect closure (as against the passage of gas or water); a device to prevent the passage or return of gas or air into a pipe or container.
3. In the fields of Physics, Fluid mechanics and Electricity: sealing.
4. In the fields of Textile Industries and Strength of Materials, the terms in use are watertightness, water-tightness, water tightness.
5. In the field of Waterproofing (Construction), the terms in use are tightness, leaktightness, leak-tightness, imperviousness.
6. In the fields of General Scientific and Technical Vocabulary, Nuclear Plant Safety, the terms in use is leak tightness.

S: 1. OED – http://www.etymonline.com/index.php?term=seal; http://www.etymonline.com/index.php?allowed_in_frame=0&search=-ing (last access: 25 November 2016). 2. MW – http://www.merriam-webster.com/dictionary/seal (last access: 25 November 2016). 3. GDT – http://www.granddictionnaire.com/ficheOqlf.aspx?Id_Fiche=3282198; http://www.granddictionnaire.com/ficheOqlf.aspx?Id_Fiche=8401705 (last access: 25 November 2016). 4 to 6. TERMIUM PLUS – http://goo.gl/r6LKgz (last access: 25 November 2016).

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CR: energy