Sound waves are mechanical waves. They can travel only through matter. They cannot travel through empty space. This was demonstrated in the 1600s by a scientist named Robert Boyle. Boyle placed a ticking clock in a sealed glass jar. The clock could be heard ticking through the air and glass of the jar. Then Boyle pumped the air out of the jar. The clock was still running, but the ticking could not be heard. Thats because the sound couldnt travel without air particles to transfer the sound energy. Is there any other place where sound cannot be heard? Here is a hint: is there any other place that does not have air molecules? Thats right, in space sound cannot be transferred. So can astronauts hear each other? Yes, they can, because they are in enclosed space stations or pressurized suits.In both cases, they are surrounded by air molecules. If they left their space ship and did not use their electronics, they would not be able to hear each other. Next time you watch a science fiction movie, think about this factoid. When spaceships are destroyed by hostile alien beings, there would be no sound heard. Sound waves can travel through many kinds of matter. 
What question would one ask from this paragraph?
In a science fiction movie when aliens destroy a spaceship why would there be no sound heard?
Ljudvågor är mekaniska vågor. De kan bara färdas genom materia. De kan inte färdas genom tomma rymden. Detta demonstrerades på 1600-talet av en forskare vid namn Robert Boyle. Boyle placerade en tickande klocka i en förseglad glasburk. Klockan kunde höras ticka genom luften och glaset på burken. Sedan pumpade Boyle ut luften ur burken. Klockan var fortfarande igång, men tickandet kunde inte höras. Det beror på att ljudet inte kunde färdas utan luftpartiklar för att överföra ljudenergin. Finns det någon annan plats där ljud inte kan höras? Här är en ledtråd: Finns det någon annan plats som inte har luftmolekyler? Just det, i rymden kan inte ljud överföras. Kan astronauter höra varandra? Ja, det kan de, eftersom de befinner sig i slutna rymdstationer eller trycksatta dräkter.I båda fallen är de omgivna av luftmolekyler. Om de lämnade sitt rymdskepp och inte använde sin elektronik skulle de inte kunna höra varandra. Nästa gång du tittar på en science fiction-film, tänk på den här faktoiden. När rymdskepp förstörs av fientliga utomjordiska varelser skulle det inte höras något ljud. Ljudvågor kan färdas genom många slags materia. Vilken fråga skulle man ställa sig från denna paragraf?
Sound waves are mechanical waves. They can only travel through matter. They can't travel through empty space. This was demonstrated in the 17th century by a researcher named Robert Boyle. Boyle placed a ticking watch in a sealed glass jar. The bell could be heard ticking through the air and the glass on the jar. Then Boyle pumped the air out of the jar. The clock was still running, but the ticking couldn't be heard. This is because the sound could not travel without air particles to transmit the sound energy. Is there another place where noises cannot be heard? Here's a clue: Is there any other place that doesn't have air molecules? That's right. In space, sound can't be transmitted. Can astronauts hear each other? Yes, they can, because they are in closed space stations or pressurized costumes.In both cases they are surrounded by air molecules. If they left their spaceship and didn't use their electronics, they wouldn't be able to hear each other. Next time you watch a science fiction movie, think about this factoid. When spaceships are destroyed by hostile alien beings, there would be no sound. Sound waves can travel through many kinds of matter. What question would be raised from this paragraph?
I en science fiction - film när utomjordingar förstör ett rymdskepp varför skulle det inte höras något ljud?
In a science fiction film when aliens destroy a spaceship why should there be no sound?