Berzelius, Jöns Jakob, Essai sur la théorie des proportions chimiques et sur l' influence chimique de l' électricité

Table of Notes

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              <pb o="69" file="0089" n="89" rhead="DES PROPORTIONS CHIMIQUES."/>
            miques . </s>
            <s xml:id="echoid-s703" xml:space="preserve">L’étincelle électrique allume l’hy- drogène, l’éther, l’argent fulminant, etc. </s>
            <s xml:id="echoid-s704" xml:space="preserve">Le
              <lb/>
            coup électrique allume tous les corps combus-
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            tibles, échauffe, fond et volatilise les métaux. </s>
            <s xml:id="echoid-s705" xml:space="preserve">La
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            décharge continue de la pile électrique échauffe
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            l’eau jusqu’à l’ébullition, et les corps solides jus-
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            qu’au feu rouge : </s>
            <s xml:id="echoid-s706" xml:space="preserve">un charbon qui est échauffé à
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            rouge dans le vide par la pile électrique, est,
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            relativement au phénomène de l’ignition, dans
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            le même état qu’un charbon qui brûle par l’oxi-
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            dation. </s>
            <s xml:id="echoid-s707" xml:space="preserve">La différence n’est pas dans l’état de la
              <lb/>
            combustion, mais dans la manière dont elle est
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            produite. </s>
            <s xml:id="echoid-s708" xml:space="preserve">Or, nous avons toujours sujet d’attri-
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            buer des phénomènes semblables aux mêmes
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            causes; </s>
            <s xml:id="echoid-s709" xml:space="preserve">et, toutes les autres manières d’expli-
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              <note symbol="(1)" position="foot" xlink:label="note-0089-01" xlink:href="note-0089-01a" xml:space="preserve">On a généralement attribué en France la produc-
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              tion de l’étincelle électrique au passage rapide de l’électri-
                <lb/>
              cité à travers l’air qui en est fortement comprimé, et s’é-
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              chauffe par le calorique que cette compression fait dégager.
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              Mais l’explication du feu électrique doit non-seulement con-
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              venir aux phénomènes du passage de la décharge électrique
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              à travers l’air, elle doit aussi être applicable à tous les phé-
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              nomènes de lumière et de calorique qui sont produits par
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              l’électricité, dans le vide, dans les liquides et dans les so-
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              lides. Il est difficile de concevoir comment, dans l’expé-
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              rience intéressante de Davy, où l’eau est échauffée jus-
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              qu’à l’ébullition par l’action de la pile voltaïque, il pour-
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              rait y avoir une compression, ou quel est le corps qui, par
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              sa compression, laisse dégager du calorique. On peut donc
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              regarder cette explication comme réfutée par nombre de
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              faits découverts postérieurement.</note>
            </s>
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