Not all the thermometers use the same system to measure temperature.We use a system called the Fahrenheit scale.But most other countries use the Centigrade scale.

　　Both systems use the freezing and boiling points of water as their guide.__2__

　　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(收缩)．That is why on hot days the mercury line is high in the glass tube.__3__

　　First.Take a clear glass juice bottle that has a cap；fill the bottle with coloured 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.

　　__4__

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

　　__5__

　　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.

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