时间:2019-02-18 作者:英语课 分类:英语听力文摘 English Digest


英语课

  Frost-free Freeze Physics

昇華是指一种物质从固态不经过液态直接转化为气态的过程,是物质在温度和气压低于三相点的时候发生的一种物态变化。与昇華相反的过程称做凝華,指物质从气态直接变成固态。這樣的例子有結霜。昇華是吸熱的反應,所需的熵是汽化熱和熔化热之和。

Frost-free freeze physics--it's more than a tongue-twister(绕口令).

Sublimation 1” is when ice turns into a gas without passing through the usual intermediary liquid state. If you leave your ice cubes in back of the freezer for a month or so, you might notice they start to shrink. That’s because they are sublimating 2: the ice is turning to water vapor 3 even though it never melted.

But I tried this experiment myself and my ice cubes never shrunk! All I got was a cold head! Then, physicist 4 John Carini explained to me that it only works if you have a frost-free freezer.


  Why is that?It’s in the nature of sublimation. When we say that ice can turn into water vapor, what we mean is that (1)fast-moving water molecules 5 can actually (2)fling themselves off the surface of the ice cube and into the surrounding air. That’s what evaporation 6 means. The more molecules that can free themselves of the ice this way, the more the ice has turned into vapor.

But wait!In order to do that, the air around the ice cube can’t (3)be saturated 7 with water already. If it is, there’s no room for more molecules and evaporation can’t take place. Frost-free freezers keep the air from becoming saturated so that it won’t freeze on the walls. But that also means ice-cubes can sublimate 8 nonstop!

Notes:

(1)fast-moving adj.移动迅速的

Candy as a fast-moving consumer goods, products price is not high, still attracts the public consumption.

糖果作为快速消费品,公司产品单价也不高,仍然吸引着大众消费。

(2)fling off发出;甩掉;挫败

It's good to fling off heavy clothing now that spring is here.

春天来了,脱掉厚厚的棉衣是适时的。

(3)be saturated with 被…所饱和;充满着

Permit this entire period of time to be saturated with BLUE LIGHT.

这段期间,让蓝色之光充满你的整个存在。



n.升华,升华物,高尚化
  • Presently, entrepreneurship, innovation and excellence-creating are the sublimation of the spirit. 在新的历史条件下,“创业创新创优”的三创精神是新时期江苏人文精神的升华。 来自互联网
  • Luleng deems that public will is a sublimation of human's free volitions. 摘要卢梭认为,公意就是人类自由意志的升华。 来自互联网
v.(使某物质)升华( sublimate的现在分词 );使净化;纯化
n.蒸汽,雾气
  • The cold wind condenses vapor into rain.冷风使水蒸气凝结成雨。
  • This new machine sometimes transpires a lot of hot vapor.这部机器有时排出大量的热气。
n.物理学家,研究物理学的人
  • He is a physicist of the first rank.他是一流的物理学家。
  • The successful physicist never puts on airs.这位卓有成就的物理学家从不摆架子。
分子( molecule的名词复数 )
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
n.蒸发,消失
  • Be careful not to lose too much liquid by evaporation.小心不要因蒸发失去太多水分。
  • Our bodies can sweat,thereby losing heat by evaporation.我们的身体能出汗,由此可以蒸发散热。
a.饱和的,充满的
  • The continuous rain had saturated the soil. 连绵不断的雨把土地淋了个透。
  • a saturated solution of sodium chloride 氯化钠饱和溶液
v.(使)升华,净化
  • We need sublimate water for our experiment.我们的实验需要纯净化的水。
  • Her sublimate future husband will be tall,dark,and handsome.她理想化的未来丈夫将是身材高大,皮肤浅黑,相貌英俊。
学英语单词
acrospiromas
analytic operator-valued function
area levelling
atomic oxygen fluence model
axial cut distance
azimuth compiler
bahorok
ballast draft condition
batch calculation
bellowed
causative factors of injury
cepalotribe
cobalt nitrate
commodity in warehouse
companion piece
completion message
concentration tracer
cu fts
despotic monarch
dextropropoxyphene
doubling course
dwarf grey willows
elbow-bone
ewan mcgregor
fakeness
flat-plate pressing machine
foot piece
free open textured sand
friction bezel ring
game-fishing
hecto-coulombs
henders
heterogenous catalysis
hog-nosed snake
hollow cathode aluminum ion laser
horsemeat
hungers
hydrophiling
ill-luck
in boundless enthusiasm
incident neutron energy
Indigosol Green IB
iner
katastates
keep your chin up
lavand
load-carrying winding
low-volume shipper
Macquarie Island
magson
Maskil
mason cities
master distance indicator
MCAIS
measurement pattern
mene, mene, tekel, upharsin
metasilicate
more significant bit
Murray State University
new productive capacity
nonoperating
numerical response
optimum capital stock
pachycholia
paramilitarisms
paratrygonica
pentapyrrolidinium
phobic layer
phrasemakings
pinos
power weight ratio
prolified
rageaholics
ravet
reactive termination
redirector
retrofittable
rookly
rotundatus
rugous
satyr plays
sea-cornet
Seckels
single-tub wagon tipper
special holder
spironolactone(anti-aldosterone)
spitball
standard money unit of account
state of permanent neutrality
statistic bit rate
steel hemp
suck at
suratenses
to service
tweer
underground gasification of coal
urcaryote
variable-duration
water regeneration technique
whip a fault out of sb.
wormly
yellowishness