They form when water vapor condenses directly into ice , which happens in the clouds .
雪花是在云体中的水蒸气直接凝结成冰时形成的。
Most elementary school students learn that clouds form when enough water vapor condenses .
大多数小学生都学过当水蒸气凝结到一定程度就形成了云。
Dew is a liquid that condenses directly on to grass and other surfaces from water vapor in the air .
露水是空气中水蒸汽直接凝结在草和其他物体表面的液态水。
Whereas refrigerative systems reduce the humidity of air ( because some water vapour condenses and is drained away ) , evaporative coolers increase humidity .
制冷系统减少空气湿度(因为一些水蒸汽凝结又流尽了),蒸发冷却机却是增加了空气湿度。
The bright yellow arcs that streak the marine cloud layer are ship tracks-clouds that form when water vapor condenses onto the myriad tiny pollution particles in ship exhaust .
划过海洋云层明亮的黄色弧线是船舶的航迹那是些由水蒸汽与船舶排放出来的无数污染微粒凝结而成的云。
When the pressure of this air parcel falls below the vapour pressure of gaseous water the water in the air condenses to form the cloud .
当这一气块的压力低于气态水的蒸汽压时,空气中的水凝结形成了云。
Clouds form when water vapor condenses or freezes onto tiny solid or liquid particles , such as dust , soot , or crystals of sea salt .
云的形成源自水蒸汽与诸如灰尘、煤烟、海盐晶体等固/液态微粒的凝结/冻结。
1 When moist , warm air rises to a cooler elevation , water condenses onto microscopic " seeds " like dust , ash , or bacteria .
1当温暖湿润的空气上升到一个凉爽的海拔高度,水便会凝结到微小的“种子”上去,如灰尘,烟灰,或细菌。
At higher altitudes , this material condenses into " rock clouds " that rain hot pebbles of different mineral compositions onto the planet 's surface .
" In the ocean , any steam immediately condenses and disappears , and what is visible are clear bubbles of carbon dioxide and a dense cloud made of tiny droplets of molten sulfur , formed when sulfur dioxide mixes with seawater , " chadwick said .