Air often gets in through badly connected pipe joints.
What type of water system - city supplied or private well? That is the foundation of your answer.
Any break or leak on the suction side of your pump can cause air in the lines.
Singing water pipes can be caused by air that is trapped in the pipes. The air can cause a whistling or singing sound, or it can cause the pipes to knock or rattle.
Call your city hall or local water company and complain there is air in your water pipes.
You should not have air in your pipes. Call a plumber.
Air can get into pipes for many reasons. If you are on a well system you may be sucking air in from loose connections. On many municipal systems there are numerous leaks and each sucks in some air to the system.
Sometimes it's caused by air in the pipes.
Air accumulates in the water pipes after a water softener cycles because the water softener stops the flow of water during this time. This usually only takes 5 to 7 minutes. Air builds up when the pipes get empty.
Yes
Well if water is too cold, pipes will contract and if water is too hot, the pipes will expand.
if the water in the pipes freezes, it will expand and break the pipes.
They shake because, the water exerts pressure when running in the pipes