Beforegoingoutsideinthemorning,manyofuscheckawindowther...
问题详情:
Before going outside in the morning, many of us check a window thermometer (温度计) for the temperature. This helps us decide what to wear. 36 We want our food to be a certain coldness in the refrigerator. We want it a certain hotness in the oven. If we don’t feel well, we use a thermometer to see if we have a fever. We keep our rooms a certain warmth in the winter and a certain coolness in the summer.
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. 37 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. 38
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.
39
Finally, place a white card on the outside of the bottle and behind the straw. Now you can see the water level easily. 40
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.
use and depend on thermometers to measure the temperature of many other things in our daily lives.
mometers measure temperature, by using materials that change in the same way when they are heated or cooled.
that you know this rule you can make a thermometer of your own that will work.
water will rise in the straw. As the temperature of the air goes up, the water will expand and rise even higher.
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.
wax ( you may use an old candle if you have one ) and melt some of it right where the straw is stuck into the cap to seal them together.
le use thermometers which are made by themselves when travelling around the world.
【回答】
AECFD
知识点:七选五题型
题型:未分类
-
在探究“光对鼠妇生活的影响”实验中属于变量的是( )A.温度 B.湿度 ...
问题详情:在探究“光对鼠妇生活的影响”实验中属于变量的是( )A.温度 B.湿度 C.光照 D.土壤【回答】C知识点:生物圈是最大的生态系统题型:选择题...
-
下列反应的离子方程式正确的是( )A.在碳**镁溶液中加入足量Ca(OH)2溶液:Mg2++2HCO3-+C...
问题详情:下列反应的离子方程式正确的是( )A.在碳**镁溶液中加入足量Ca(OH)2溶液:Mg2++2HCO3-+Ca2++2OH-=MgCO3↓+CaCO3↓+2H2OB.电解饱和食盐水:C.过量的铁与浓**反应: Fe+6H++3NO3-=Fe3+十3NO2↑+3H2OD.向硫*铝铵[NH4Al(SO4)2]溶液中滴加足量Ba(OH)2溶液 NH4++Al...
-
在恒温、体积为2L的密闭容器中进行反应:2A(g)⇌3B(g)+C(g),若反应物在前20sA物质由3mol降...
问题详情:在恒温、体积为2L的密闭容器中进行反应:2A(g)⇌3B(g)+C(g),若反应物在前20sA物质由3mol降为1.8mol,则前20s的平均反应速度为()A.v(B)=0.03mol/(L•s)B.v(B)=0.045mol/(L•s)C.v(C)=0.03mol/(L•s)D.v(C)=0.06mol/(L•s)【回答】考点:化学反应速率和化学计量数的关系.专题:化学反应速率专...
-
光明在低头的一瞬 ...
问题详情: 光明在低头的一瞬 迟子建 ...
相关文章
- 阅读理解 Oneeveningtwoyoungmenwerewalkinginthestreettogethe...
- TheBlogofRosie TheWeekendByRosie|June6,2016Hi!I’monvaca...
- 根据短文内容完成表格。 LiKeren,theSenior2boyfromDongguanHighSchool...
- 单项选择。Wow!Therearesomanynicegiftsintheshop.Idon'tknowwhi...
- Socialnetworkingisn’tonlyfortheunder40s.Morethan25perce...
- BEIJING,Oct.16(Friday)(Xinhua)--TheChinesegovernmentwil...
- TheInternetisbecomingimportantinourlife.Howmuchdoyoukno...
- Ifyoueverimaginedwalkingonafootbridgewhichishanginghigh...
- -I'mgettinghungry.Doyouknowwherewecangetsomegoodfood?-O...
- WhenDawnBonfield,theformerchiefexecutiveoftheWomen'sEng...