Search Results - Porosity
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Porosity is a measure of the void spaces in a material, and is measured as a fraction, between 0–1, or as a percentage between 0–100%. The term porosity is used in multiple fields including manufacturing, earth sciences and construction. Used in geology, hydrogeology, soil science, and building science, the porosity of a porous medium (such as rock or sediment) describes the fraction of void space in the material, where the void may contain, for example, air or water. It is defined by the ratio where VV is the volume of void-space (such as fluids) and VT is the total or bulk volume of material, including the solid and void components. Both the mathematical symbols f and n are used to denote porosity. Porosity is a fraction between 0 and 1, typically ranging from less than 0.01 for solid granite to more than 0.5 for peat and clay, although it may also be represented in percent terms by multiplying the fraction by 100.
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Showing 1 to 10 of 10 Articles matching 'Porosity' in related articles. |
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1. Medicines For Osteoporosis Treatment
July 08, 2008
Bones always imply hardness. What would happen if bones are no longer hard and tough? The term osteoporosis means 'porosity of bones'. It is more common as age advances, in post-menopausal females, chronic smokers and alcoholics, those taking corticosteroids or have blood cancer. The bones become weak and easily break with minor injuries and fall. The
backbone and leg bones are commonly affected. A diet low in calcium is also a contributing factor. The diagnosis is made by a test called bone-mass-density (BMD) and its unit is T-Score. A T-Score less than 2.5 is considered to be signific... (read more)
Author: Francis Adam
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2. Your best gardening friends: Earthworms.
April 22, 2008
Research has shown that earthworm excrement, also called castings or vermicompost, improves the aeration, porosity, structure, drainage, and moisture-holding capacity of soil.
Many studies prove that when compared to conventional composts, vermicompost is less variable and much more stable. Mixing vermicompost into the planting medium essentially eliminated the need for additional fertilizer in the production of tomato plugs as one example.
Studies show that earthworm castings increase height, stem diameter, enhance root growth, increase dry weight, and produce more... (read more)
Author: Musharf Ansari
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3. Limestone flooring: The modern choice for kitchen flooring
October 23, 2007
If you are hunting for durable kitchen flooring, then you must consider limestone flooring as your top most choice. Available in subtle patterns and pale, neutral colors, limestone makes a great choice for modern kitchen flooring and design. It is an ideal choice because it provides hardness, low porosity and has eye catching features. The stone is extremely durable and comes with oil resistant properties.
Limestone should be sealed properly in order to prevent staining and to maintain its look. Usually, this stone is available for consumers in a honed look. Most homeowners, architects a... (read more)
Author: Steve Manik
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4. Process of Cleaning and Sealing Granite
August 22, 2007
There are only two essential procedures to pay attention when it comes to granite countertops. If you do these correctly, you would enjoy the innate beauty of your granite for a lifetime.
Granite Sealing
All granite tiles and countertops must be sealed. Although granites are comparatively the same hardness, they have various levels of porosity. A universal rule is that the lighter the color of your granite, the more absorbent it would be. Follow the sealer directions to correctly relate the correct amount of sealer to your granite. Most prominently, do not ever allow your sealer dry ... (read more)
Author: Agnes uma
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5. How to Let Natural Sandstone Compliment Your Kitchen Design
June 09, 2007
Sandstone kitchen floors are created from a sedimentary rock that is composed of quartz and feldspar, sand-sized mineral and rock grains. Sandstone countertops are the product of sand and sediment having been squeezed together for millions of years and held together by a natural cement, such as silica. Natural sandstone is an extremely hard and tough material. Sandstone is the youngest of the quartz-based stones, with each stone having a different level of porosity, hardness and compressive strength. This process has produced a natural beauty that is unrivaled. This is why sandstone kitc... (read more)
Author: James Mahoney
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6. Get the Best Countertops
January 19, 2007
Choosing The Best Countertop
Today, countertops are no longer considered extravagant and exclusive only used by the rich and famous to showcase their wealth and aesthetic tastes but even normal middle class people can afford them. People usually want to decorate their kitchen and bathroom tops to match the color, theme and environment of their residences. But there are so many options available in the market that more often than not homeowners get confused while choosing the best counters that suit their demand. So how do you choose the most suitable countertop to make your kitch... (read more)
Author: Josveek O. Hugilar
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7. Stain Care Guide & Techniques
January 08, 2007
Introduction
Purchasing and installing natural stones is an investment in lasting beauty that will give you many years of pleasure and joy. However, stones are porous materials. This porosity is why they stain so easily. It is also why stains can be removed. In other words, the stone has literally absorbed the stain and we simply re-absorb it. But it is very important to know the proper care procedures to extent the life and enhance the beauty of natural stones. There are also pre-prepared poultice mixes that have the chemicals already added. All you have to do is add water.
Facts... (read more)
Author: Josveek O. Hugilar
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8. Ageless Limestone For Your Kitchen Flooring
December 28, 2006
Limestone can be a good choice for kitchen flooring due to its subtle patterning and pale, neutral colors. This all makes limestone kitchen flooring a good choice in contemporary kitchen design. It is also a good choice because it provides hardness, low porosity, looks attractive, and is hardwearing and long-lasting. It also has oil resistant properties, although is should be sealed to prevent staining and to keep it looking its best and to be able to clean and maintain. So limestone is usually offered in a honed (unpolished) finish. Its softer, subtle hues make it a frequent choice of hom... (read more)
Author: James Mahoney
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9. Marble Countertops
March 01, 2006
The first function of a countertop – be it of a bar, kitchen or bathroom – is to provide a suitably elevated working space. A suitably located countertop can help minimize spillage. The second function of a countertop is to be decorative. A medium like wood, though potentially decorative, cannot withstand moisture for long.Natural marble is among the most visually appealing surfaces for countertops today, but it does have its limitations owing to its porosity. There is no sure-fire way of ‘proofing’ marble against staining from tea, coffee, juices and certain cosmetics. However, it is practica... (read more)
Author: Jimmy Sturo
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10. Marble Repair
March 01, 2006
Minor blemishes in marble caused by stains or scratches can be corrected by a good grade polishing powder or tin dioxide, available at most leading monument or household maintenance stores. Rubbing in the powder with a properly mounted piece of felt and waxing over the affected area should do the trick.However, marble’s extreme porosity makes it susceptible to more serious damage, like easy chipping, cracking or breakage. Where actual pieces of marble have broken away, the separated pieces should be located and all edges wiped down with acetone. This will remove all foreign material and facili... (read more)
Author: Jimmy Sturo
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