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 lever easily.5.
As the temperature goes down,the water will contract,and the lever in the straw will come down.Perhaps you will want to keep a record of the water lever in the straw each morning for a week.
A.We use and depend on thermometers to measure the temperature of many other things.
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.
E.They label these in different ways.On the Fahrenheit scale water freezes at 32 degrees and boils at 212 degrees.On the Celsius scale water freezes at 0 degrees and boils at 100 degrees.
F.Take wax (you may use an old candle if you have one) and melt some of it right where the straw is struck into the cap to seal (把……粘住) them together.
G.People use thermometers which are made by themselves when travelling around the world.
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