What happens when water drops?
When a drop encounters a solid surface, its initial spherical shape is forced into a pancake-like form that stretches out over the surface. The drop subsequently retracts and can either detach from the surface, as happens for pure water (b), or remain bound to the surface, like the polyethylene oxide solution (c).
Why do droplets form spheres?
Surface tension is responsible for the shape of liquid droplets. Although easily deformed, droplets of water tend to be pulled into a spherical shape by the cohesive forces of the surface layer. In the absence of other forces, including gravity, drops of virtually all liquids would be approximately spherical.
What is the drop liquid method?
‘drop’) is one of the most common methods for measuring surface tension. The principle is to measure the weight of drops of a fluid of interest falling from a capillary glass tube, and thereby calculate the surface tension of the fluid. From it we can determine the surface tension.
What are the factors that affect the size of a drop?
In addition to confirming conventional knowledge that nozzle type, orifice size, and spray pressure are primary factors affecting droplet size, the SDTF determined that three physical properties of the spray mixture typically affect droplet size spectra: 1) dynamic surface tension, 2) extensional viscosity, and 3) …
What is Tate’s law?
Tate’s law is the basis for the drop-weight method for de- termining surface tension.The proportionality constant, as. shown below, contains the surface tension of the liquid. being used. Tate’s law may be used to determine the radius.
Does viscosity affect drop size?
The results of this project proved that the viscosity of a liquid does not affect the size or shape of its droplet so that the liquid with a higher viscosity has a longer neck.
What causes a drop in red blood cells?
Causes for Blood Count to Drop 1 Myelofibrosis and Leukemia. Myelofibrosis is a serious bone marrow disorder that causes a drop in red blood count and disrupts the normal production of blood cells, according to MayoClinic.com. 2 Anemia. Anemia is a drop in red blood cells. 3 Chemotherapy. 4 Medications. …
What happens when a droplet hits a liquid surface?
Due to the different refractive index of water and air, refraction and reflection occur on the surfaces of raindrops, leading to rainbow formation. Drops dripping into water. Problems playing this file? See media help. The major source of sound when a droplet hits a liquid surface is the resonance of excited bubbles trapped underwater.
Why does my blood pressure drop when I get Up?
It could occur when a person’s blood pressure drops after they experience pain or dehydration or get up too quickly. This type of syncope tends to occur more in children and young adults. A cardiac syncope is more serious as it could signal an underlying problem with the heart.
What causes a person to have a drop attack?
Figuring out why a drop attack happened is one way to avoid having it happen again. A drop attack is a sudden fall that seems to happen without cause. There are, however, many underlying conditions, such as heart problems and seizures, which might cause a drop attack to occur.