Bernstein, Aaron, Naturwissenschaftliche Volksbücher, Bd. 12-16, 1897

Table of contents

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            ſtrömen laſſen. </s>
            <s xml:id="echoid-s3570" xml:space="preserve">Das Waſſer oben kocht und entwickelt Dampf,
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            während unten, wo man das Gläschen in den Fingern hält,
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            keine ſonderliche Wärme herrſcht. </s>
            <s xml:id="echoid-s3571" xml:space="preserve">Man lernt hieraus, wie
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            man ein kochendes Waſſergefäß ruhig in der Hand halten kann,
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            ohne ſich zu verbrennen. </s>
            <s xml:id="echoid-s3572" xml:space="preserve">Es iſt dies darum möglich, weil
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            Waſſer ein ſchlechter Leiter der Wärme iſt. </s>
            <s xml:id="echoid-s3573" xml:space="preserve">Die obere Hitze
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            dringt nicht nach unten. </s>
            <s xml:id="echoid-s3574" xml:space="preserve">Man ſieht aber auch dabei, was da
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            vorgeht, wenn Waſſer erhitzt wird. </s>
            <s xml:id="echoid-s3575" xml:space="preserve">Es verwandelt ſich das
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            Waſſer in Gas und bildet erſt kleine und dann größere Blaſen;
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            </s>
            <s xml:id="echoid-s3576" xml:space="preserve">die Blaſen ſteigen nach oben und bilden beim Ausſtrömen in
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            die Luft Waſſerdampf. </s>
            <s xml:id="echoid-s3577" xml:space="preserve">Waſſerdampf iſt Waſſer, welches über
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            100 Grad Celſius heiß iſt und nunmehr Luftgeſtalt annimmt.</s>
            <s xml:id="echoid-s3578" xml:space="preserve"/>
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        <div xml:id="echoid-div100" type="section" level="1" n="90">
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            <emph style="bf">V. Eine Kochflaſche.</emph>
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            <s xml:id="echoid-s3579" xml:space="preserve">In guten Glashandlungen bekommt man auch ſehr billig
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            eine Kochflaſche, die wir zu verſchiedenen Experimenten brauchen
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            werden. </s>
            <s xml:id="echoid-s3580" xml:space="preserve">Es iſt dies eine Flaſche aus dünnem Glaſe, welche
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            unten rund iſt und alſo nicht ſtehen kann. </s>
            <s xml:id="echoid-s3581" xml:space="preserve">Mit ſolcher Koch-
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            flaſche kann man viele ſchöne Experimente anſtellen, ſobald
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            man ſich dazu einer Vorrichtung bedient, durch welche man
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            die Flaſche über die brennende Lampe bringen kann. </s>
            <s xml:id="echoid-s3582" xml:space="preserve">In
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            ordentlichen Laboratorien hat man dazu Ständer, ſog. </s>
            <s xml:id="echoid-s3583" xml:space="preserve">Retorten-
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            halter. </s>
            <s xml:id="echoid-s3584" xml:space="preserve">Es beſteht ein ſolcher aus einem Stock, der auf einem
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            breiten Brett befeſtigt iſt. </s>
            <s xml:id="echoid-s3585" xml:space="preserve">An dieſem Stock befindet ſich ein
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            drehbarer Arm, den man beliebig hoch oder niedrig ſtellen
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            kann und der vorne zwei Brettchen hat, zwiſchen welchen man
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            den Hals der Flaſche ſteckt und ſie durch eine Schraube ſo
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            aneinander bringt, daß ſie die Flaſche feſthalten. </s>
            <s xml:id="echoid-s3586" xml:space="preserve">Wer ſich
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            einen ſolchen Ständer kaufen kann, der etwa zwei Mark koſtet,
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            der thut gut daran. </s>
            <s xml:id="echoid-s3587" xml:space="preserve">Wer jedoch die Ausgabe ſcheut, kann </s>
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