I've a question about silencer. I want to make a
Silencer that'll either decrease or mute sound of
Exhaust fan fitted in the room's wall.
I read somewhere that sound of a silencer of a car is
Decreased because smoke enters from high pressure
Towards low pressure. But my thinking is that silencer
Of a car works because some part of the sound is
Blocked by that part of the silencer whose volume is
More because of which as soon as the sound waves in the
Smoke enters in that huge volume, some parts of sound
Hit the walls surrounding outer whole of that huge
Volume box & as a result volume of the sound is
Decreased.

http://geocities.com/idrees_scientist/Silencer.htm

So is my understanig of silencer right that sound is
Dimmed because some parts of the sound waves can't
Escape from the huge volumed box of the silencer?
Please visit this, here I've depicted what I want to ask.
http://geocities.com/idrees_scientist/Silencer.htm

Not quite - the way a muffler on a car works is it smooths out the major peaks and valleys in the pressure of the exhaust gasses. An automobile engine produces very sharp and high pressure waves in the exhaust, which we hear as loud noise. When the exhaust gas enters the muffler it buffers the pressure waves into a more constant stream - actually through its geometry by cancelling out the pressure peaks and valleys in the gas stream. Consequently we don't perceive it as being as loud.

Here's a more complete explanation:

Howstuffworks "How Mufflers Work" (http://auto.howstuffworks.com/muffler.htm)

Not quite - the way a muffler on a car works is it smooths out the major peaks and valleys in the pressure of the exhaust gasses. An automobile engine produces very sharp and high pressure waves in the exhaust, which we hear as loud noise. When the exhaust gas enters the muffler it buffers the pressure waves into a more constant stream - actually through its geometry by cancelling out the pressure peaks and valleys in the gas stream. Consequently we don't perceive it as being as loud.

Here's a more complete explanation:

Howstuffworks "How Mufflers Work" (http://auto.howstuffworks.com/muffler.htm)

I don't know how to make a silencer in which exhaust fan's coprissions and rarafactions can be cpmbined