小实验
<p>今天上午，我和爷爷做了一个小实验。</p><p><span word="This">This</span> <span word="morning">morning</span>, <span word="Grandpa">Grandpa</span> <span word="and">and</span> <span word="I">I</span> <span word="did">did</span> <span word="a">a</span> <span word="little">little</span> <span word="experiment">experiment</span>.</p><p>首先，拿一个大碗，点燃一根蜡烛（短的），用蜡烛油把蜡烛固定在碗底上。接着，把红色的水倒进大碗里（不要太多）。然后，把透明的玻璃杯罩在蜡烛上。过了一会儿，蜡烛就灭了，杯子里的水面升高了。</p><p><span word="First">First</span>, <span word="take">take</span> <span word="a">a</span> <span word="big">big</span> <span word="bowl">bowl</span>, <span word="light">light</span> <span word="a">a</span> <span word="candle">candle</span> (<span word="short">short</span> <span word="one">one</span>), <span word="and">and</span> <span word="fix">fix</span> <span word="the">the</span> <span word="candle">candle</span> <span word="on">on</span> <span word="the">the</span> <span word="bottom">bottom</span> <span word="of">of</span> <span word="the">the</span> <span word="bowl">bowl</span> <span word="with">with</span> <span word="candle">candle</span> <span word="oil">oil</span>. <span word="Then">Then</span>, <span word="pour">pour</span> <span word="the">the</span> <span word="red">red</span> <span word="water">water</span> <span word="into">into</span> <span word="the">the</span> <span word="big">big</span> <span word="bowl">bowl</span> (<span word="not">not</span> <span word="too">too</span> <span word="much">much</span>). <span word="Then">Then</span>, <span word="put">put</span> <span word="the">the</span> <span word="transparent">transparent</span> <span word="glass">glass</span> <span word="over">over</span> <span word="the">the</span> <span word="candle">candle</span>. <span word="After">After</span> <span word="a">a</span> <span word="while">while</span>, <span word="the">the</span> <span word="candle">candle</span> <span word="went">went</span> <span word="out">out</span> <span word="and">and</span> <span word="the">the</span> <span word="water">water</span> <span word="in">in</span> <span word="the">the</span> <span word="cup">cup</span> <span word="Rose">Rose</span>.</p><p>这个小实验告诉我们，氧气能够帮助燃烧，氧气用完了，蜡烛就会灭的。这时杯子里的气压比外面的低，水被压到杯子里去。所以，杯子里的水面升高了。</p><p><span word="This">This</span> <span word="little">little</span> <span word="experiment">experiment</span> <span word="tells">tells</span> <span word="us">us</span> <span word="that">that</span> <span word="oxygen">oxygen</span> <span word="can">can</span> <span word="help">help</span> <span word="burn">burn</span>. <span word="When">When</span> <span word="oxygen">oxygen</span> <span word="is">is</span> <span word="used">used</span> <span word="up">up</span>, <span word="the">the</span> <span word="candle">candle</span> <span word="will">will</span> <span word="go">go</span> <span word="out">out</span>. <span word="At">At</span> <span word="this">this</span> <span word="time">time</span>, <span word="the">the</span> <span word="air">air</span> <span word="pressure">pressure</span> <span word="in">in</span> <span word="the">the</span> <span word="cup">cup</span> <span word="is">is</span> <span word="lower">lower</span> <span word="than">than</span> <span word="that">that</span> <span word="outside">outside</span>, <span word="and">and</span> <span word="the">the</span> <span word="water">water</span> <span word="is">is</span> <span word="pressed">pressed</span> <span word="into">into</span> <span word="the">the</span> <span word="cup">cup</span>. <span word="So">So</span>, <span word="the">the</span> <span word="water">water</span> <span word="in">in</span> <span word="the">the</span> <span word="cup">cup</span> <span word="rises">rises</span>.</p><p>今天的小实验好有趣呀！以后，我还要请爷爷教做更多的实验。</p><p><span word="What">What</span> <span word="an">an</span> <span word="interesting">interesting</span> <span word="experiment">experiment</span> <span word="today">today</span>! <span word="Later">Later</span>, <span word="I">I</span> <span word="will">will</span> <span word="ask">ask</span> <span word="grandpa">grandpa</span> <span word="to">to</span> <span word="teach">teach</span> <span word="me">me</span> <span word="more">more</span> <span word="experiments">experiments</span>.</p>
页:
[1]