17

　　.

　　The most common kind of thermometer is made with mercury (水银) inside a clear glass tube. As mercury (or any other liquid) becomes hot, it expands. As it gets colder, it contracts. That is why on hot days the mercury line is high in the glass tube.

　　18

　　.

　　First, take a clear glass juice bottle that has a cap; fill the bottle with colored water. Tap a hole in the center of the cap using a hammer and thick nail. Put the cap on the jar. Then stick a plastic straw (吸管) through the nail hole.

　　19

　　.

　　Finally, place a white card on the outside of the bottle and behind the straw. Now you can see the water level easily.

　　20

　　.

　　As the temperature goes down, the water will contract, and the level in the straw will come down. Perhaps you will want to keep a record of the water level in the straw each morning for a week.

　　A．We use and depend on thermometers to measure the temperature of many other things in our daily lives.

　　B．Thermometers measure temperature, by using materials that change in the same way when they are heated or cooled.

　　C．Now that you know this rule you can make a thermometer of your own that will work.

　　D．The water will rise in the straw. As the temperature of the air goes up, the water will expand and rise even higher.

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