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Lettris
Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
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English dictionary
Main references
Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).
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The wordgames anagrams, crossword, Lettris and Boggle are provided by Memodata.
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Translation
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Le bar (symbole bar) est une unité de mesure de pression équivalent à 105 pascals. Le bar présente l'intérêt d'être voisin de l'atmosphère (pression atmosphérique moyenne à la surface de la mer). C'est une unité en dehors du système international (SI) qui dérive de la barye (1 bar = 1 000 000 baryes).
Le mot provient du mot grec ancien βάρος / báros qui signifie pesanteur.
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Le bar est utilisé dans les domaines de la plongée sous-marine, de la météorologie et de l'industrie des gaz où l'on utilise surtout sa subdivision, le millibar (symbole mbar) aujourd'hui rebaptisé hectopascal (hPa).
Note orthographique : alors que le mot bar s'accorde au pluriel (« la pression est mesurée en bars »), le symbole bar est invariable, comme le sont tous les symboles.
Un bar vaut 105 pascals (100 kPa ou 0,1 MPa) ou encore 100 kilonewtons par mètre carré (100 kN·m-2 = 100 kPa) donc aussi 10 N·cm-2 (1 daN·cm-2).
De manière abusive, on considère souvent que 1 bar vaut 1 kgf·cm-2. Cela est faux à 2 % près, soit la différence entre le décanewton (10 N) et le kilogramme-force (9,80665 N).
Une autre unité de pression anglaise très courante est le PSI (Pound per square inch : « livre par pouce carré »). Généralement, 100 PSI = 6,89 bar.