有2條問題想問 20分 用英文答

1.Why do we use HELIUM balloon ??
pressure inside the balloon >>> pressure outside the balloon,
the balloon will explode into many pieces
pressure outside the balloon ↓ as altitude ↑
and pressure inside the balloon remains unchanged
hence, finally, the pressure inside the balloon will be larger than pressure outside the balloon ,so the plastic extends
up to a level that the plastic break
Which is so called the elastic limit of the plastic of the balloon

2.Why don't we use HYDROGEN balloon ??
This is because hydrogen is the lighest gas in the world
Its density is lower than air
So if a balloon filled with hydrogen it will go up in air
But hydrogen is quite explosive and flammable thus we do not
usually use it

Why don't we use HYDROGEN balloon ??

It is because hydrogen is more flammable than helium!!
Long time ago,people use hydrogon to fill in a airship.
When the airship goes up to about 10,000 foot,the hydrogen
was gone out and the visitor smoke!
So, it light up the hydrgon ,then it is explosion,all the people
dead!

1.Why do we use HELIUM balloon ??
We use helium to fill the ballon is because it is lighter than air. In the Periodic table helium has a atomic mass of 2 which means it is really light and it is lighter than air because air is a mixture of nitrogen, oxygen, carbon dioxide and a few more type of gas.

2.Why don't we use HYDROGEN balloon ??
We don't use hydrogen balloon is becasue it is very dangerous. although hydrogen is very easy to get but it is a very reactive element because in its atomic shell, there is no electron, which means it could react with air and all sort of stuff. it could explode

try this:
http://www.howstuffworks.com/helium.htm
that'd do!! :)

1.
Is the W rubber balloon creates by what?
The high innate nature balloon is by the rubber latex which natural forms creates. But the rubber latex may pass through the nature to degrade its disintegration rate to be extremely rapid. But the balloon then can start soon after the air flush to oxidize forms the frost shape in the surface. When the balloon meets the high temperature or the sunlight then can the accelerated oxidation, but the natural microorganism still could make the natural rubber latex decomposition in darkness. The entire degeneration process decided according to at that time the environment, even could short to several weeks.
The rubber latex comes from there?
The rubber latex is by the growth the milky liquid which produces in the tropical rain forest rubber tree. At present Malaysia is the global biggest natural rubber latex yieldly. Only needs the knife to cut open the bark then the obvious rubber latex to flow out, by now the available cup will flow out the rubber latex carried. Like this gathers the rubber latex not to be able to cause the permanent damage to the rubber tree, but each tree may supply the collection rubber latex to reach for 40 years long time. Because the rubber tree may permanent have the profit, therefore the people cannot fell them to make the tropical rain forest to be possible to be able the permanent preservation.

2.How does the balloon is print?
The most present balloon all uses the present most popular three methods to carry on printing. In the printing like imagination carries on by no means in the plane, but is spurts the ink in the gasification situation, moves India or the silk India way carries on.
When carries on the balloon gasification printing, it only can gasify to 75-80%. This can have the balloon surface the foot 夠 tensity to make printing ink India in the surface. Printing uses the printing ink must suit the balloon use, but they should be attached to on the airballoon cover not to be able suitably to permeate the inner layer to make go through a hole. After the printing ink does, the balloon then can deflate and put in the dryer to make its reply original condition to carry on again the packing.
One popular printing method is ink-jet. When printing the balloon can pass through the automatic gasification by multicolor to spurt the ink first to spurt again on the revolving balloon surface. This can create continuously and is surrounding the balloon design. Obviously arrives generally design like playing cards, stripe, star, note and so on. The innate nature prints which with this method compares other man-power to print the method slightly for not 夠 clearly, but the cost is low.
The second printing method is moves India. The printing ink can spurt first on the plate, the plate printing ink India in the India tube, after the balloon gasification then can again in the India tube the windlass printing ink India on the balloon.
The third printing method is silk India, also is the most artificial crowded method. This method needed to press the silk India pattern plate in has imitated the balloon surface which was mad, again passed the printing ink on the pattern plate eyelet India on the balloon. Is similar to on a balloon to need in all around India many different designs, then this working procedure must duplicate carries on many times. Usually also may automate the machinery to carry on silk India for the middle and small scale balloon. After printing the balloon can deflate and carry on the dry procedure only then to pack. Because prints the balloon to need the massive manpower therefore the price is also more expensive than the non-printing balloon.
Why the balloon does demolish when can have the bang?
Is opposite with the general estimate, the balloon demolishes when occurs because the sound by no means the compressed gas rapidly discharges actually creates