There may be a number of causes. First, check your PRV and see if you can adjust it to higher pressure. This is usually easy and may solve your problem. If new construction has gone up nearby, mains pressure may be lower. Also remove and clean all aerators and see if that makes a difference. Many people totally ignore this basic step.
You have to undo the aerator at the end of the faucet and clean the screen or plastic water saver out. It will be plugged with sand or sediment.
If you are on city water, a large pipe has burst somewhere causing pressure to drop drastically. If you are on a well, a problem has occurred in your pump, or your pressure tank, or the main pipe between well and house. In extremely cold weather pipes from a well can burst. Many well heads (at least in my area) are very inadequately protected.
There are many cause of this, but the primary reasons are in the pressure tank. The tank MUST have residual air pressure of around 27 psi to drive the water system. To analyse further I need to know what kind of tank you have and what air pressure is in it when the water ceases to flow. I need to know what pressure your pump starts and if the tank feels heavy (full of water) when the pressure is low.
No and yes. No, you won't get more water pressure. To do that you'll need to find out why the water pressure is low. Perhaps flow restriction, perhaps a poorly adjusted water pressure regulator, perhaps low pressure from the well/city water. But an additional water heater will certainly give you more hot water. It would be like putting in a LARGER water heater. In most cities the water pressure required is about 20 PSI. Small city's do not add pressure pumps to their system but use a gravity supply. That is why most places there is a pressure problem either build their water tanks taller or erect them on a hill.
Yup
Defective bladder / low pressure inside the tank
Something is wrong in your pressure tank, possibly waterlogged and rusting.
You have to undo the aerator at the end of the faucet and clean the screen or plastic water saver out. It will be plugged with sand or sediment.
Low and high pressure systems. Obviously if you have a Low pressure system the barometric pressure will get low. High pressure causes the barometric pressure to rise.
If you are on a well it means you have a problem in the pressure tank. On city water means pressure in general is down, or your PRV is failing.
low/poor water pressure coming from the utilities/street
Low pressure favors evaporation.
A wall cloud marks an area of low pressure within a mesocyclone. The pressure drop causes a temperature drop, which in turn causes water vapr to condense.
No. Low tire pressure causes poor handling and poor tire wear.
No, too high of water pressure causes problems.
It could be low water pressure or a partial blockage in an inlet valve.
Water vapor can exist at low temperatures (below 100 °C = 132 °F) only if pressure is very low.