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. ……

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 ……

, 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 ……

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 ……

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 ……

plants have more antioxidants than lighter ones.Protection on the insideThe bad chemicals aren...(来源) of these chemicals.If you breathepolluted(污染的) air, you take in chemicals that also cause ……

This mobile phone is only 40.1g. It is lighter than an egg. Dav Moran, an Israeli (以色列人) made it on February 11, 2008. ……

AC and let the warm wind blow down. Since hot air is lighter than cold air, the warm wind.... Since hot air is lighter than cold air, the warm wind will then go up.●  Open the window from ……

steel poles (钢架), which makes it 50 percent lighter and smaller than other tents. All you need is an air pump (气筒) to set it up. The company said it takes just one person and one air pump to set it up ……

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 ……

single. So why not treat yourself to this Butterfly Heater? You fill it with a little lighter fluid, and it goes to work pumping out warm air through its butterfly pattern. It's portable and safe enough ……

The cigarette lighter was invented before the match. ……

The cigarette lighter was invented before the match. ……