why water doesnt flow when tap is closed
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only because the mechanism of tap do not allow water to flow
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It's the shape of the tap - in fact the very reason for their being a tap rather than just a valve on the end of the pipe.
When you open the valve slightly the water does come out at high speed, hits the inside of the tap spout and is stopped - it then runs out of the tap at slow speed instead of spraying you.
Imagine if you put your finger over the end of the tap to create a spray but then collected that spray in another pipe and looked at the water coming out of the other end of the pipe - it would be a slow trickle, just like the tap.
When you open the valve slightly the water does come out at high speed, hits the inside of the tap spout and is stopped - it then runs out of the tap at slow speed instead of spraying you.
Imagine if you put your finger over the end of the tap to create a spray but then collected that spray in another pipe and looked at the water coming out of the other end of the pipe - it would be a slow trickle, just like the tap.
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