Petrol forms vapour above a certain temperature.

高于一定的温度汽油就形成蒸气。

Heated,water will change to vapour.

水经过加热就会变成蒸气。

Clouds are formations of condensed water vapour.

云是由凝聚的水蒸气构成的。

When water changes to water vapour, we say it evaporates.

当水变成水蒸气时，我们把这个过程叫做蒸发。

When water changes to water vapour, we say it evaporates.

当水变成水蒸气时，我们把这个过程叫做蒸发。

The watery vapour transpired from the surface of leaves.

水汽从叶子里蒸发了。

water vapour

水蒸气

...water vapour.

水蒸气

How can the water become vapour?

水怎样能变成蒸气?

Homogeneous nucleation is made possible by statistical fluctuations among molecular aggregates in the vapour.

同质成核作用之所以可能,是由于蒸汽中分子凝聚的统计起伏.

Humidity: Quantity of water vapour in unit volume of air.

湿度: 在单位容积内的水气数量.

Clouds are formations of condensed water vapour.

云是由凝聚的水蒸气构成的.

This causes more and more water vapour to condense.

这就使越来越多的水蒸气凝结.

Cancel water vapour permeability coefficient.

取消了水蒸气渗透系数.

There are nitrogen, oxygen, a little carbon dioxide and water vapour.

它们分别是氮气, 氧气, 少量的二氧化碳和水蒸汽.

However, it does not require an absorbed vapour layer to become effective.

然而, 它不需要被吸收的水汽层来发挥效能.

A cloud is a condensation of water vapour in the atmosphere.

云是由大气中的水蒸气凝结成的.

The vapour generator for chemical vapour deposition plants allows the extraction of vapours.

用于化学汽相沉积器的蒸汽发生器允许蒸汽抽提.

It is effective, but mercury vapour is extremely toxic.

这种方式非常有效, 但是汞(即水银)蒸气却含有剧毒.

If you do not have excellent, solvent vapour will open near liquid solvent containers.

如果操纵精良的透风前提, 溶剂蒸汽不离会在开不收的不流体溶剂容器相近堆积.

To allow the water vapour to escape from the crucible.

容许水汽从坩埚中离开.

Quantity of water vapour in unit volume of air.

在单位容积内的水气数量.

Pollution for noise, dust, vapour, waste liquid in manufacture of fiber filament were investigated and measured.

对涤纶长丝生产过程中的噪声 、 粉尘 、 气体 、 废液等的污染进行了调查和测量.

The higher the temperature of the air, the more water vapour it can absorb.

空气的温度越高,它能吸收的水蒸汽就越多.

It can change water into vapour.

它能把水变成蒸汽.

A cloud is a mass of vapour in the sky.

云是天空中的水汽团块.

For water, this fluid is denser than vapour, but lighter than liquid water.

对水来说, 这种液态比气体更加致密, 但是比液态的水更轻.

Water can change from liquid state into ice or vapour.

水能从液态变成冰或水蒸汽.

Then the vapour changes back into liquid and gives out heat.

然后蒸汽变回液体和解放热气.

Based on the balancebalancemomentum balance , a dynamic model for water vapour heating furnace was developed.

开发了乙烯装置中蒸气过热炉的动态模型.

If it were not for the vapour in the air, there would be no dew.

如果空气中没有水气, 就没有露水.

This light can be used to illuminate a glass bulb containing sodium vapour.

可以用这种光来照射一个含有钠蒸气的玻璃泡.

This reduces the chance of vapour lock.

它减少了气锁的机会.

Water vapour condenses to form clouds.

水蒸气凝结形成云。

1. A cloud is a mass of vapour in the sky.
   云是天空中的水汽团块。
2. Strange vapours burst out of the factory during the accident.
   事故发生的时候,有奇怪的水汽从工厂里喷出来。
3. The glass tank contains hot mercury vapour.
   那个玻璃容器里盛放的是热的水银蒸汽。

介词+～

• vapour">fly〔pass〕 off in vapour化为蒸汽消散,蒸发
• vapour">change〔convert〕 into vapour把…变成蒸汽

• They could see each other's breath, faint vapour in the steadily growing moonlight.

  出自：U. Le Guin

• I could see his breath and my own vapouring..in the freezing air.

  出自：H. E. Bates

n.(名词)

vapour, steam

这两个词都可以指“水汽,蒸汽”。其区别是：

steam指水沸时变成的蒸汽; vapour比steam含义广,常常指由于温度的突然变化而产生的气体。例如:

A cloud is a mass of vapour in the sky.云块就是天上大量的水汽。

steam，vapour

这两个名词均有“蒸汽”之意。

steam通常指作为动力的蒸汽或水沸腾后产生的蒸汽或水汽。

vapour与steam常可换用，多用于科体文章中，指临界温度下气态的物质。

• ☆ 14世纪晚期进入英语，直接源自古法语的vapor，意为蒸汽；最初源自拉丁语的vaporem，意为热气。