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back-pressure
back-pressure n.
Brit. 
/ˈbakˌprɛʃə/
, /ˈbakˌprɛʃə/U.S. /ˈbækˌprɛʃər/
in the steam-engine, the resistance of the atmosphere or waste steam to the piston; also, any resistance to the flow of a liquid or gas; also attributive./ˈbækˌprɛʃər/ΘΚΠ
the world > matter > physics > mechanics > force > [noun] > resistance > other specific resistance
water resistance1827
back-pressure1860
point resistance1941
1860 Encycl. Brit. XX. 600/2 The mean back-pressure..exceeds the pressure of condensation.
a1877 E. H. Knight Pract. Dict. Mech. I. 206/2 Back-pressure valve, a ball or clack-valve in a pipe.
1930 Engineering 5 Dec. 699/2 To this station will be supplied all the surplus power generated by the back-pressure turbine.
1940 Chambers's Techn. Dict. 69/1 Back-pressure, air pressure in pipes when it exceeds atmospheric pressure.
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