但不会用英语回答PS:别被那么多题目吓到其实都不难但我不知道怎么用英语回答比较书面的英语答题语句不会写c.Atmosphericpressuredecreaseswithincreasingaltitude.Withthisfactinmind,explainwhyhelium-

Question

但不会用英语回答
PS:别被那么多题目吓到 其实都不难 但我不知道怎么用英语回答 比较书面的英语答题语句不会写
c.Atmospheric pressure decreases with increasing altitude.With this fact in mind,explain why helium- filled weather balloons are underinflated when they are launched from earth.
d.A commonly used packing material consists of “bubbles” of air trapped between bonded layers of plastic,known as bubble wrap.Using the ideal gas law,explain why this packing material offers less protection on cold days than on warm days.
e.At the start of a trip,a driver adjusts the absolute pressure in her tires to be 2.81 x 105 Pa when the outdoor temperature is 284 K.At the end of the trip she measures the pressure to be 3.01 x 105 Pa.Ignoring the expansion of the tires,find the air temperature inside the tires at the end of the trip
f.A 50 mL glass vial of xenon gas at 23 ˚C and 130 kPa was placed in the refrigerator,where the temperature was 3.6 ˚C.What is the pressure of the chilled xenon gas in the vial?
g.A lung-full of air (350 cm3) is exhaled into a machine that measures lung capacity.If the air is exhaled from the lungs at a pressure of 1.08 atm at 37 ˚C,but the machine is at 0.958 atm and 23 ˚C,what is the volume of air measured by the machine?
h.In a diesel engine,the piston compresses air at 305 K to a volume that is one-sixteenth of the original volume and a pressure that is 48.5 times the original pressure.What is the temperature of the air after the compression?
第C题为什么充满HE的气象气球升越高,反而会缩小?气球不是升的越高,体积膨胀吗?还是有单词我理解错了?第D题请用PV=NRT解释,一定要根据公式,最好用英文回答；第E题我是真的不懂,只知道outdoor的温度,怎么求indoor的温度呢?也用公式解答；第F和G题我都知道用PV=NRT回答,第F题是否先根据已知求出N,再用3.6摄氏度带进去求P?思路对否?至于第G题,1.08ATM是气压吗?也是先算出N,再带新值算出V?如果思路对了,请告诉我怎么用英语表示之前之后的V、P等,怎么用英语书面语回答,重点!最后H题,思路挺模糊,我最不明白N要怎么求出来,还是这题不必求出确切的N值?这题用中文告诉答案也行,我会想办法翻译的.

Answer 1

第C题的意思是,为什么气象气球从地面发射时是未充满气的,并不是说它升到高空会缩小.
underinflated 是 未充满气的.
D题,就是根据PV=nRT,P,n不变,温度T降低,V减小.不知道英文该咋回答.
E题,题目是告诉了你室外的温度,让你求的是轮胎内气体的温度,不是室内温度,轮胎内气体的温度在开车前是等于室外温度的.这题不考虑轮胎膨胀,所以V不变,根据PV=nRT,可以求出温度和压强的关系,就能求出轮胎内气体的温度了.
F题你的思路是对的,因为体积不变,根据温度变化求压强变化.
G题,atm表示标准大气压1.01*10^5Pa.知道P,T求V,英语我也不清楚应该怎么表达.
H题,不用求出来n的值,直接用 PV=nRT 求出来 T=PV/nR,把P和V变化前后的倍数关系带进去,得到T变化的倍数,就能求出来了.
英语回答我实在是无能为力了,没有试过用英文的.