pFn.

Brit.

/ˌpiːˈɛf/, U.S.

/ˌpiˈɛf/

Origin: Formed within English, by compounding. Etymons: pH n., English F.

Etymology: < p- (in pH n.) + F (representing free energy: see quot. 1935).

Soil Science.

The logarithm to the base 10 of the moisture tension of a soil.

ΚΠ

1935 R. K. Schofield in Trans. 3rd Internat. Congr. Soil Sci. 2 39 It has proved convenient to use a new scale, which I have called the pF scale, to express what has, in the previous pages, been called ‘suction’... The symbol ‘p’ expresses its logarithmic character, while the symbol ‘F’ is intended to remind us that by defining pF as the logarithm of the height in centimetres of the water column needed to give the suction in question, we are really using the logarithm of a free energy difference measured on a gravity scale.

1946 H. J. Lutz & R. F. Chandler Forest Soils ix. 292 Designation of the energy relations of soil water in terms of pF is analogous to specification of reaction in terms of pH.

1979 Jrnl. Appl. Ecol. 16 532 The water content was roughly uniform in the top 5 cm with a potential about 0.31 bar, equivalent to pF 2.5.

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

pf n. (also PF) Music (a) pianoforte; (b) [initialism < Italian piano forte] soft then loud; (c) [initialism < Italian più forte] more loudly.

ΘΚΠ

society > leisure > the arts > music > written or printed music > directions > [adverb] > for volume

forte1724

fortissimo1724

pf1724

più piano1724

piano1762

rinforzando1775

crescendo1776

mancando1786

sforzando1786

sforzato1786

forzando1828

society > leisure > the arts > music > musical instrument > keyboard instrument > stringed keyboards > [noun] > pianoforte

pf1724

pianoforte1741

fortepiano1769

piano1772

joanna1846

music box1850

box1902

1724 Short Explic. Foreign Words Musick Bks. 32 Piu forte, or PF, is a Degree louder than forte only.

1876 J. Stainer & W. A. Barrett Dict. Musical Terms 348/2 P.f., abb. of (1) Pianoforte. (2) Piano, forte, soft then loud. (3) Più forte, louder.

1938 R. E. M. Harding Origins Musical Time & Expressions 102 In this same work..are found PFs on single held semibreves.

1999 Ventura County Star (Calif.) (Nexis) 5 Nov. 16 ‘Pf’ stands for pianoforte. We thought it sounded intellectual.

单词	pf
释义	pFn. Brit. /ˌpiːˈɛf/, U.S. /ˌpiˈɛf/ Origin: Formed within English, by compounding. Etymons: pH n., English F. Etymology: < p- (in pH n.) + F (representing free energy: see quot. 1935). Soil Science. The logarithm to the base 10 of the moisture tension of a soil. ΚΠ 1935 R. K. Schofield in Trans. 3rd Internat. Congr. Soil Sci. 2 39 It has proved convenient to use a new scale, which I have called the pF scale, to express what has, in the previous pages, been called ‘suction’... The symbol ‘p’ expresses its logarithmic character, while the symbol ‘F’ is intended to remind us that by defining pF as the logarithm of the height in centimetres of the water column needed to give the suction in question, we are really using the logarithm of a free energy difference measured on a gravity scale. 1946 H. J. Lutz & R. F. Chandler Forest Soils ix. 292 Designation of the energy relations of soil water in terms of pF is analogous to specification of reaction in terms of pH. 1979 Jrnl. Appl. Ecol. 16 532 The water content was roughly uniform in the top 5 cm with a potential about 0.31 bar, equivalent to pF 2.5. This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). > as lemmas pf pf n. (also PF) Music (a) pianoforte; (b) [initialism < Italian piano forte] soft then loud; (c) [initialism < Italian più forte] more loudly. ΘΚΠ society > leisure > the arts > music > written or printed music > directions > [adverb] > for volume forte1724 fortissimo1724 pf1724 più piano1724 piano1762 rinforzando1775 crescendo1776 mancando1786 sforzando1786 sforzato1786 forzando1828 society > leisure > the arts > music > musical instrument > keyboard instrument > stringed keyboards > [noun] > pianoforte pf1724 pianoforte1741 fortepiano1769 piano1772 joanna1846 music box1850 box1902 1724 Short Explic. Foreign Words Musick Bks. 32 Piu forte, or PF, is a Degree louder than forte only. 1876 J. Stainer & W. A. Barrett Dict. Musical Terms 348/2 P.f., abb. of (1) Pianoforte. (2) Piano, forte, soft then loud. (3) Più forte, louder. 1938 R. E. M. Harding Origins Musical Time & Expressions 102 In this same work..are found PFs on single held semibreves. 1999 Ventura County Star (Calif.) (Nexis) 5 Nov. 16 ‘Pf’ stands for pianoforte. We thought it sounded intellectual. extracted from Pn. < n.1935 as lemmas
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pFn.

> as lemmas