If it still doesn't work try this link . There's a rather famous movie called Alien. They were right, because there are not enough molecules of air to carry the sound of the screaming. At least, that would be the case in a perfect vacuum, but even though we've gone looking into the depths of the Universe itself, we've never found a perfect vacuum. As far as scientists are concerned, a vacuum is just a volume of space that contains no matter.
Vacuums are very important to the human race.
We use vacuums in light bulbs, TV sets and electron tubes, putting coatings on lenses to increase the amount of light that goes through, preparing plasma for blood banks, and to make metals that would otherwise react with the atmosphere, such as titanium. A vacuum preserved the World's oldest-known cake. This cake is on display in the Alimentarium, a museum of food in Switzerland. This cake was sealed and vacuum-packed around 4,200 years ago, and then placed in the grave of Pepionkh in ancient Egypt. The cake is about 11 centimetres across, and has honey on the inside and sesame on outside.