Gravity or the force of you sucking/blowing on said straw.
One way to make fluid flow up a straw is by creating a vacuum by sucking on one end of the straw. This reduces the air pressure inside the straw, allowing the higher external air pressure to push the fluid up the straw and into your mouth.
Serum.
Your finger prevents air from entering through the top of the straw. As fluid moves down the straw it leaves a void in it's wake, one that is usually immediately filled by air. By preventing the air from entering the top of the straw, the fluid cannot move downwards because to do so would leave a vacuum space between your finger and the fluid; this "sucks" the fluid back in into place and prevents it from decending down the straw.
No.Plasma is a straw coloured fluid in blood.
A juice box straw is. When you suck in you create an area of low pressure in the straw. The fluid inside the juice box rushes into the straw and up into your mouth. This is one of the most basic one though
Buoyant force makes a straw and clay ball float. When an object is placed in a fluid, such as water, the fluid exerts an upward force on the object that is equal to the weight of the fluid displaced by the object, causing it to float.
Plasma
Yes, liquids rise in a straw due to atmospheric pressure. When you reduce the pressure inside the straw by sucking, it creates a partial vacuum which causes the atmospheric pressure on the surface of the liquid to push it up into the straw.
Normal pericardial fluid is clear to straw colored. During pathological examination normal pericardial fluid does not contain blood, cancer cells, or bacteria.
The straw-colored fluid you are referring to is likely cerebrospinal fluid (CSF), which is a clear and colorless fluid found in the brain and spinal cord. CSF helps protect the brain and spinal cord, provides nutrients, and removes waste products. It is typically obtained through a procedure called a lumbar puncture (spinal tap) for diagnostic purposes.
The part of the milkshake that is in the upper portion of the straw is exposed to a warmer environment than the bottom of the straw. Since the bottom remains cold longer it continues to plug the lower end of the straw while the upper portion of milkshake begins to expand in volume as it thaws. Since the bottom is plugged and the capacity of the straw remains constant, the increased volume of fluid spills out of the top of the straw.
Dry straw is an insulator.