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Permeability in fluid mechanics and the Earth Sciences (commonly symbolized as ?, or k) is a measure of the ability of a porous material (often, a rock or unconsolidated material) to allow fluids to pass through it.
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What are all the functions of a cell membrane in all cells?
Due to its semi permability a cell membrane controls what goes in and out of the cell..in simplicity it determines what is right to enter the cell.
What is the ideal viscosity range of lotion and skin cream?
1.5x10e5 to about 5.0x10e5 cps, depending on where on the skin and whether you refer to apparent, evident, inherent or which viscosity exactly. Skin permeability changes. Permability across your palms is substantially lower than that across the back of your hands. Impossible really to answer.
How much force is required in mph to stick a small piece of string in the human skin?
Force is measured in newtons, speed would be mph. You would have to know the permability of skin, the force needed to break the surface, and then you could find how fast a piece of string would need to move. I don't feel like finding that data, but if you find it I can tell you.
A cells contents would be the same as its surrounds were it not for?
If it were not for the cell membrane serving as a selectively permeable barrier, the cell's contents would equilibrate with its surroundings due to diffusion. This membrane controls the movement of substances in and out of the cell, allowing it to maintain its internal environment and carry out essential cellular functions.
Why is the core made of nickel and iron?
The core of the Earth is composed primarily of nickel and iron because these elements were abundant in the materials present during the formation of the planet. Nickel and iron are dense metals that sank to the center of the Earth due to their high density, forming the core over time.
Which light is used to calculate light year?
It doesn't matter what light is used, as the speed of light in a vacuum is the same for any wavelength of light. The speed of light, c (3 x 10^8 m/s) is a fundamental constant of nature and applies to all wavelengths of the electromagnetic spectrum - of which light is a small section. The speed of light, c can be calculated, without observation by measuring other constants through equations such as E=mc2 or, a product of the permativity and permability of free space, or Maxwell's equations. These sorts of equation relate particle physics to wave mechanics and show that an electromagnetic wave can be considered as particles and mass can be considered as waves.
What is the permeability of No. 8 gravel No. 67 limstone No. 8 limestone No. 57 stone and limestone sand?
The gravels will be very fast. The permability of the sand will depend on how clean it is. As more material passes the No. 200 sieve, permeability will rapidly decrease. At 10 to 15 percent, ponding will easily occur.
What s the perforation service in the oil field?
A perforating service is the act of perforating holes thru the steel caseing, thru the cement used to secure and seal the caseing to the earth, and out into the oil or gas producing zone. Perforating a well uses a wireline truck which contains a large spool of wire line or cable. Inside the wireline or cable are electrical wires that are used to run special equipment on board the truck to locate the oil zone. After the zone is located, this same wire line is used to lower the "perforating gun" into the caseing and locate it properly. After the proper location is established the electrical wires are used to detonate explosive charges that do the actual perforating of the caseing,cement and oil zone. These "perforations" or holes, are where the oil or gas enter the caseing to be produced at the surface. Usually the same company that dose the perforating of an oil well, will have other services that use the same cable, spool and electrical wireing. These services are known as "logging" and consist of electronic equipment that help the oil man determine if the well has penetrated an oil or gas zone. Measurements such as thickness, oil or water content of the zone, percent of permability etc. can be determined from these verious logs.
What are the chemical and physical properties of plastics?
Properties of PlasticSome physical properties: transparency, flexibility, elasticity, permeability, water resistant, electrical resistance, Specific Gravity, soft when hot.Some chemical properties: solubility, chemical resistance, thermal stability, reactivity with water, flammability, heat of combustion
How does a molecules polarity affect the way it passes through a membrane?
The permeability of membranes is the ease of molecules to pass through it. Permability depends mainly on the electric charge of the molecule and to a lesser extent the molar mass of the molecule. Electrically-neutral and small molecules pass the membrane easier than charged, large ones.
