/sci/ - Science & Math

[Anonymous No.10489370]

Why is it that when you upturn a full piss bottle that the piss will flow out violently and noisily. But when you empty the bottle at an angle, the piss flows quicker, quieter, and smoother than a serene mountain stream?

Also, this is perhaps not your area of expertise but why is it that once you wizz into a bottle and then seal the cap, the bottle soon starts to compress inside and crumple up?

Also, one final question. What is that white precipitate that forms at the bottom of the bottle after some time has passed?

[Anonymous No.10489383]

>>10489370
2 reasons:
1) When you hold it at an angle, you allow space for air to enter the void in the bottle left begin by the escaping piss. When it is vertical, a vacuum is left behind the piss and air tries to enter through the same hole that piss is flowing out of
2) When you hold the bottle vertical, there is a larger hydraulic head on the piss than of it was at an angle, giving it more velocity, increasing the Reynold's number, giving you a more turbulent flow

[Anonymous No.10489386]

>>10489370
>What is that white precipitate that forms at the bottom of the bottle after some time has passed
Salt

[Anonymous No.10489394]

>>10489386
And urea, probably.
The bottle might be crumpling because the air inside compresses as it cools. You could test this by heating water in a plastic bottle to 40C and closing it.