I AM as large as a castle, yet lighter than air. One hundred men and their horses cannot move me. What am I?Answer:The castle’s shadow. ……

1. What lives in the corner but travels the world?2. I’m lighter than air but a million men can’t lift me. What am I?Answer: 1. Post stamp 2. Bubble. ……

, people flew inballoons(气球). The balloons were full of hot air or gas that was lighter than air.In 1783, Frenchmen built the first balloon to carry people into the air. OnceNapoleon(拿破仑) used balloons ……

bigger and become lighter than the air around it. Finally your sun-warmed garbage bag will fly... go up because the hot air is lighter than the same amount (数量) of cool air. The trick (窍门) to heating ……

bigger and become lighter than the air around it. Finally your sun-warmed garbage bag will fly... go up because the hot air is lighter than the same amount (数量) of cool air. The trick (窍门 ……

the vocal cords move, the higher your voice sounds.Helium is lighter than air so when you breathe in helium... when you breathe it in?A: Any sound isvibrating(振动) air set in motion by a vibrating object. When you ……

new electric airship美国公司建成使用氢气的超大型电动飞艇美国公司建成使用氢气的超大型电动飞艇US company Lighter Than Air (LTA) Research.... It could be used for air travel. The airship uses helium (氦), a gas (气体) lighter than air, to lift ……

are actually a mixture of foam (泡沫) and lighter-than-air gases such as helium (氦).The company uses... they use comes from plants and they say it finally "disappears in the air". ……

. Like a balloon, they are filled with gas (气体) that is lighter than air. The gas can lift (升起...), either. Like a balloon, they are filled with gas (气体) that is lighter than air. The gas can lift (升起 ……

is not lighter than air. Its 400,000 cubic metres of helium lift only two-thirds of the craft's weight...A US company is building a giant flying cruise ship that could change the way you think about air ……

“鬼才”导演蒂姆·波顿再出奇幻新作。A girl has lots of sharp teeth in the back of her head. Another girl is lighter than air and flies on a rope (绳子). A boy has bees living inside of him. Sounds strange and even a bit ……

? The balloon is usually filled with helium (氦气) or hydrogen (氢气), which are both much lighter than air... filled with helium (氦气) or hydrogen (氢气), which are both much lighter than air, and it flies because ……

changes."This is possible. One of the tricks is to do it with helium, which is lighter than air so it goes up and the air circulation takes care of it. Then you can start again from below," Frater ……

field). It is filled with hydrogen (氢气), which is much lighter than air. When it flies, it lifts... than air. When it flies, it lifts the capsule (舱) connected to it. The capsule can carry eight ……

flight.C. It can fly faster than a plane.D. It can carry 700 people.Lighter than air (P6)Choose...;t need a runway.D. Its gas is lighter than air.3. Which of the following makes the airship safer ……